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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallSafe coral fragging means taking a healthy piece of an established colony, attaching it to a solid mount and giving it stable conditions to grow as a genetically identical clone. The method is straightforward only when the colony is ready, the tool matches its structure, and cutting, dipping and rinsing are kept out of the display tank. Zoanthids and Palythoa require an additional toxin-focused safety protocol because they can contain palytoxin.
What coral fragging is—and what “cloning” means
Fragging is asexual propagation. You remove a living fragment from a parent colony, secure it to a plug, disc or rubble, and allow it to heal and expand. Because there is no mating or exchange of genetic material, the new colony is a clone of the parent: it has the same genotype, although its color, growth form and health can still be changed by light, flow, nutrition, pests and other environmental conditions.
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NOAA describes fragmentation as carefully cutting or breaking a healthy colony into smaller fragments that can grow into independent colonies. The same technique is used in aquariums and in some reef-restoration programs. A frag is not guaranteed to survive simply because the parent did; the cut creates an injury, and the new piece has less tissue and stored energy with which to recover.
When a colony is ready to frag
Start with a colony that is healthy, established and growing in your aquarium. Do not cut a coral that is pale, receding, newly imported, recently moved, showing unexplained tissue loss or carrying an active disease. A stressed parent may lose additional tissue after the cut, while a weak fragment may fail to attach or be overwhelmed by infection and pests.
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Check the aquarium first
Fragging should be done in a cycled system with stable reef conditions, appropriate lighting and suitable water movement. Measure the parameters that matter to your setup, including calcium, alkalinity, magnesium and phosphate, rather than relying only on visual appearance. OATA identifies these categories, along with reliable filtration, lighting and flow, as core reef-aquarium provisions.
NOAA’s coral-culture guidance associates successful growth with clear water, low pollutant loads, balanced pH and temperature, adequate oxygen, and freedom from contaminants and disease-causing organisms. Stability matters more than chasing a particular number for a day. If temperature, salinity or alkalinity is swinging, postpone the cut and correct the system first.
Choose a sensible first target
A branching colony is usually the least complicated place to learn because a branch can be removed cleanly and mounted with minimal skeletal damage. Soft corals can also be cut, but their loose tissue needs a secure way to stay in contact with a mount. Thick, massive colonies require a saw and more control over fragments, dust and splash. Never sacrifice a prized or irreplaceable colony while learning a technique.
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Prepare everything before lifting the parent from the aquarium. A clean, organized station shortens the time the coral spends out of stable water and prevents a fragment from being dropped while you search for glue or a plug.
Basic workstation
- A tray or container filled with water from the aquarium for holding the parent and freshly cut pieces.
- A second container for any commercial coral dip.
- A third container of clean, temperature-matched saltwater for rinsing after the dip.
- Absorbent towels, a waste container and a stable work surface.
- Coral bone cutters or shears for branching skeletons.
- A sharp, dedicated blade for soft corals.
- An appropriate coral or masonry saw for thick, massive skeletons.
- Forceps or tweezers for handling loose tissue and manually removing visible pests.
- Ceramic plugs, frag discs or small pieces of clean rubble.
- Reef-safe cyanoacrylate gel, epoxy, or both, selected for the coral and mounting surface.
- A frag rack, isolated shelf or quarantine container where the new mount can be observed.
- Gloves, eye protection and splash-resistant clothing.
Keep cutting tools sharp and clean. A dull cutter crushes skeletal branches and transfers more force into living tissue. Do not use a tool that has contacted household cleaners, metals that can rust into the water, or another aquarium with a disease problem unless it has been properly cleaned and dried.
Safety rules before you cut
General splash protection
Wear gloves and eye protection for every fragging session. Keep hands away from your face, and cover cuts or abrasions before starting. Work slowly enough to control the coral and tool; a sudden snap can send saltwater or skeletal chips toward your eyes. Wash tools and hands after the session, and keep children and pets away from the work area.
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The zoanthid and Palythoa exception
Zoanthids and Palythoa must be treated as potentially toxic. The CDC reports that these corals produce palytoxin, a respiratory irritant associated with eye, skin and inhalation exposure. Aquarium-associated cases have included respiratory irritation and systemic illness. The CDC also notes that no single evidence-based hobbyist personal-protective-equipment standard has been established, so use a conservative approach: gloves, sealed eye protection, good ventilation and splash control.
Never boil, heat, torch, microwave or otherwise deliberately warm zoanthids or Palythoa. Heating can aerosolize toxin. Do not scrape dry tissue, use compressed air, or create a spray. Keep the coral submerged or wet while cutting, prevent splashes, and clean contaminated surfaces carefully. If exposure occurs, stop handling, move to fresh air when inhalation is possible, rinse affected skin or eyes with copious clean water, and seek urgent medical advice or contact local poison-control services. Do not induce vomiting after swallowing aquarium water or tissue.
In a 2015 CDC/FDA investigation, laboratory analyses measured 7.3 milligrams of crude palytoxin per gram of wet zoanthid tissue in one sample and 6.2 milligrams per gram in another. Those values describe the investigated samples, not a universal concentration for every colony, species or aquarium.
Match the technique to coral structure
| Coral structure | Cutting method | Mounting approach | Main hazards and controls |
|---|---|---|---|
| Branching SPS | Bone cutters or shears through a healthy branch | Cyanoacrylate gel on a plug; a small rubble piece also works | Crushing from dull tools; avoid pinching living tissue |
| Branching LPS | Clean cut through a healthy branch, using cutters sized for the skeleton | Plug, disc or rubble held securely until tissue grows over the attachment point | Protect fleshy polyps from abrasion and excessive handling |
| Soft coral | Sharp blade for a single clean cut | Gel, mesh, toothpick method or a container that prevents the piece from drifting; choose a reef-safe method suited to the species | Loose tissue can detach; avoid crushing or letting it contact neighboring corals |
| Massive or thick-skeleton coral | Appropriate saw with controlled cutting and splash management | Epoxy, gel or a combination on rubble, disc or plug | Skeleton dust and fragments; keep debris out of the display and rinse thoroughly |
| Zoanthids and Palythoa | Sharp blade or cutters while keeping tissue wet; use toxin precautions | Plug, disc or rubble with a stable adhesive | Palytoxin exposure; never heat or aerosolize material |
Exact cut locations depend on genus and growth form. Cut only through healthy tissue and skeleton, leaving enough living material on both the parent and fragment. A tiny sliver with little tissue has less reserve for recovery; a fragment that is unnecessarily large removes more of the parent than needed.
Step-by-step: a controlled fragging workflow
1. Set up separate water containers
Fill the parent container, dip container and rinse container before removing the coral. Use clean, temperature-matched saltwater for the rinse. Label containers if several corals or dip products are involved. Never pour used dip water into the display aquarium.
2. Photograph and inspect the parent
Take a quick reference photograph if the colony has a distinctive pattern or if you are tracking growth. Look for recession, bleaching, exposed skeleton, unwanted algae, flatworms, nudibranchs, egg masses and other pests. If disease or a pest outbreak is suspected, isolate the colony instead of propagating it; fragging can spread the problem to every new mount.
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3. Remove the colony with minimal stress
Turn off pumps that would push the colony against equipment, then lift it into the holding container. Keep tissue submerged whenever practical. Do not squeeze fleshy polyps or drag the colony across rock. If it is attached permanently, cut a branch or section in place only when you can control fragments and prevent debris from entering pumps or neighboring corals.
4. Make the coral-specific cut
For a branching SPS or LPS, support the branch and make one decisive cut through healthy skeleton with bone cutters or shears. For soft coral, use a sharp blade to make a clean incision rather than sawing back and forth. For a thick, massive skeleton, use a suitable saw and contain the cutting water and dust. Keep both the parent and fragment wet, and discard crushed or visibly damaged pieces rather than mounting them as if they were healthy.
5. Inspect every fragment
Under bright light, examine the cut surface and the underside for pests and eggs. Use forceps to remove visible hitchhikers. A dip is an aid to inspection and pest reduction, not proof that a fragment is clean. Eggs can remain attached, and some organisms tolerate or avoid a dip.
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If you use a commercial coral dip, measure the concentration and exposure time exactly as its label specifies. Do not mix dip products or improvise a stronger solution. Gently agitate or baste the coral as directed so water reaches crevices, but do not keep a weak or severely injured coral in a dip longer than the label permits. Dips can stress already compromised tissue and may not kill every egg.
7. Rinse in a separate container
Transfer the coral to the prepared clean-saltwater rinse. A gentle swish removes residual dip and loosened debris. Keep the rinse out of the display and discard it after use. If multiple colonies are being processed, use fresh rinse water when cross-contamination is a concern.
8. Attach the fragment
Choose a mount that matches the growth habit. A frag disc provides a broad, low profile for encrusting corals. A plug is convenient for branching SPS and for racks designed around standard plugs. Rubble looks natural and offers flexible placement, but an irregular piece can tip until the adhesive cures.
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Dry only the small contact area of the plug and the fragment enough for the adhesive to bond; keep the living tissue moist. Apply a modest bead of reef-safe cyanoacrylate gel to the mount, press the skeletal base or nonliving attachment area into it, and hold it steady as directed by the adhesive. Epoxy can reinforce a larger or irregular connection. Do not bury living tissue in glue or smear adhesive over polyps.
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Put the new frag where you can inspect it without shading it, blasting it with direct flow or allowing a neighboring coral to sting it. A rack or isolated observation area makes detachment and pests easier to spot. Return pumps gradually so the mount is not toppled before the adhesive has set.
Light, flow and recovery
There is no universal healing schedule, PAR target or flow number that applies to every coral genus and aquarium. The correct recovery setting depends on the parent colony’s previous conditions, tissue type, depth, water movement and the stability of the system. A newly cut frag generally benefits from the same broad environmental range in which its parent was thriving, with changes made gradually rather than a sudden move to intense light or turbulent flow.
Inspect the mount regularly for tissue recession, exposed skeleton, detachment, pests, brown or discolored tissue, and overgrowth by algae or neighboring organisms. If the frag is being physically battered, move it to gentler indirect flow. If it is collecting detritus, improve circulation without directing a damaging jet at the cut surface. Adjust lighting slowly and record what changed; avoid changing several variables at once.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Biosecurity: dipping is only one layer
A complete biosecurity routine combines inspection, manual removal, dipping when appropriate, rinsing and observation. Quarantine is especially valuable for valuable colonies or systems that cannot tolerate an introduced pest. Keep tools, containers and racks dedicated to quarantine when possible. Never return water from a dip or a suspect system to the display.
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- Inspection: examine the parent, cut surfaces, plug and underside under strong light.
- Manual removal: pick off visible pests and egg masses with forceps or a suitable tool.
- Dip: use one labeled product at its stated dose and duration.
- Rinse: move the coral through separate clean saltwater before placement.
- Observation: monitor the frag and parent for delayed recession or emerging pests.
- Isolation: keep suspect colonies away from healthy display corals until the problem is understood.
Because dips may miss eggs and can harm weak corals, repeating an indiscriminate dip is not a substitute for identifying the pest or disease. When tissue loss continues, remove the affected coral from the display and seek advice specific to its genus and symptoms rather than spreading it through additional cuts.
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Common mistakes and how to correct them
Cutting a stressed colony
Symptom: the parent was already pale or receding, and both parent and frag deteriorate after cutting.
Correction: stop propagation, stabilize water quality and lighting, and address the original stressor before attempting another frag.
Using the wrong or dull tool
Symptom: crushed skeleton, ragged tissue or a fragment that will not stay attached.
Correction: match shears, cutters, a blade or a saw to the coral’s structure and replace or sharpen damaged tools.
Putting dip water in the display
Symptom: the display receives cloudy, chemically treated or pest-laden water after a frag session.
Correction: keep dip and rinse containers separate, discard used water and use a clean container for every transfer.
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Assuming a dip removes all pests
Symptom: pests reappear days or weeks after a supposedly clean frag is mounted.
Correction: inspect for eggs, manually remove what you can, isolate the coral and continue observation rather than relying on one dip.
Gluing living tissue
Symptom: tissue around the mount turns white, recedes or fails to expand.
Correction: bond the skeletal base or another nonliving contact area, use less adhesive and keep glue away from polyps and exposed tissue.
Exposing zoanthids to heat or aerosols
Symptom: respiratory, eye or skin irritation after handling a zoanthid or Palythoa colony.
Correction: leave the area, obtain urgent medical guidance, and never repeat heating, dry scraping or spray-producing handling.
Choosing a mount: plug, disc or rubble
| Mount | Best use | Advantages | Trade-offs |
|---|---|---|---|
| Ceramic frag plug | Branching SPS and rack-based systems | Easy to position, exchange and inspect | Can look artificial until the coral encrusts it |
| Frag disc | Encrusting or spreading corals | Broad surface encourages an even base and stable attachment | Requires enough room for the colony to spread |
| Small rubble | Natural-looking displays and irregular growth forms | Flexible shape and easy to blend into aquascape | May tip or shift; difficult to standardize on a rack |
Whichever mount you choose, make the attachment mechanically stable before returning it to strong flow. A fragment that repeatedly falls can damage its tissue and spread pests to other surfaces.
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How to decide whether to frag at all
- Frag now: the colony is healthy, established, growing and large enough to spare tissue; the aquarium is stable; and you have a controlled workstation.
- Wait: the coral is newly acquired, recovering from transport, pale, receding, recently moved or in a system with unstable parameters.
- Do not propagate: you suspect active disease or a pest outbreak that would be copied onto every fragment.
- Use extra controls: the coral is a zoanthid or Palythoa, the cut requires a saw, or the colony is valuable enough to justify quarantine and extended observation.
What success looks like
Success is not a fixed number of days until a frag “heals.” The practical indicators are stable attachment, no continuing tissue recession, normal extension for that coral, clean tissue margins and gradual growth from the cut or encrusting edge. Record the date, parent colony, tool, mount, dip used, and placement. Those notes let you identify whether a problem followed cutting, dipping, mounting or a later change in the aquarium.
The parent colony and the clone should be monitored separately. A parent can appear fine while a small frag loses tissue, and a frag can recover while a large parent develops a delayed infection. Keep the new coral away from aggressive neighbors until it has established a secure base.
Quick Recap
Key takeaways
- Cut only a healthy, established colony in stable, clean water.
- Use cutters or shears for branching skeletons, a sharp blade for soft corals and a controlled saw for thick skeletons.
- Prepare separate parent, dip and rinse containers before starting.
- Inspect manually, follow any dip label exactly, and remember that dips may miss eggs or stress weak corals.
- Mount the fragment to a plug, disc or rubble with reef-safe adhesive while keeping glue off living tissue.
- Provide gradual, species-appropriate light and flow; no universal healing time or PAR value is established.
- Treat zoanthids and Palythoa as potential palytoxin hazards: prevent splashes, wear gloves and eye protection, maintain ventilation, and never heat them.
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