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Coral fragging is a form of asexual propagation: you cut or break a healthy piece from an established parent colony, attach it to a solid substrate, and let it grow into a separate colony. The new coral is a genetic clone of the parent. Fragging is safest when the aquarium is mature and stable, the tool matches the coral’s structure, cutting and dipping occur outside the display tank, and every fragment is observed afterward.
The most important exception is zoanthids and Palythoa. These corals can contain palytoxin, so fragging requires unusually careful splash, eye, skin and inhalation protection. Never boil or heat them, and do not create aerosols by scraping or handling dried tissue.
What coral fragging actually does
A coral fragment, or frag, is a piece of a parent colony that continues living independently after separation. NOAA describes fragmentation as cutting or breaking a healthy colony into smaller pieces that can grow into new colonies. Because the process is asexual, the offspring is genetically identical to the parent rather than a seedling produced by sexual reproduction.
In a reef aquarium, fragging can make an overgrown colony manageable, preserve a healthy genotype, or provide a way to share coral without removing an entire colony. It is not a treatment for a failing coral. Cutting a pale, receding, newly imported or diseased colony usually adds stress and can spread problems to every piece.
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Successful propagation depends on the same fundamentals as any other reef husbandry: clear water with low pollutant levels, balanced pH and temperature, adequate oxygen, and no contaminants or disease-causing organisms. The aquarium also needs appropriate reef lighting and flow, with calcium, alkalinity, magnesium and phosphate measured as relevant to the system.
Decide whether the colony is ready
Use an established, healthy parent
- Choose a colony that has been stable in the aquarium long enough to show normal tissue coverage, coloration and growth.
- Do not cut a coral that is bleaching, receding, freshly imported, damaged by transport or showing signs of active disease.
- Leave enough healthy parent tissue that the original colony can continue growing. A frag is not successful if the parent is sacrificed to produce it.
Confirm stable aquarium conditions
Before making a cut, verify that the system is cycled and that its reef conditions are steady rather than swinging between water changes or dosing events. Check the water-quality categories that matter for the animals in your aquarium, including calcium, alkalinity, magnesium and phosphate. Appropriate light, oxygenation and water movement are also prerequisites. There is no single set of numbers that applies to every coral genus, so stability and the needs of the particular coral matter more than copying a universal target.
Choose tools by coral structure
The correct tool makes a clean cut with less crushing and tearing. Match the method to the skeleton or tissue instead of forcing every coral through the same procedure.
| Coral structure | Cutting tool | Typical mount | Main concern |
|---|---|---|---|
| Soft coral | Sharp blade or knife | Rubble, plug or disc | Make a clean tissue cut and prevent the piece from drifting or being overgrown. |
| Branching SPS | Coral bone cutters or shears | Frag plug or small rubble | Cut a healthy branch without crushing it; secure the small piece firmly. |
| Branching LPS | Cutters or shears suited to the branch thickness | Plug, disc or rubble | Protect living tissue and avoid placing pressure on fleshy areas. |
| Thick or massive skeleton | Appropriate coral saw | Disc or rubble large enough to support the cut face | Control dust and splash, and keep the cut stable while it heals. |
Use sharp, clean instruments. A dull cutter can crush the skeleton and tissue instead of separating it. Exact cut locations depend on the genus and its morphology; the safe principle is to cut through healthy material and leave a viable amount of tissue on both parent and fragment.
Prepare a separate fragging workstation
Do not perform cutting, dipping and rinsing directly over the display aquarium. Set up a tray or work area before removing the parent so the coral is out of water for as little time as practical.
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- A container of aquarium water for the parent and newly cut pieces.
- A separate container for any commercial coral dip.
- A third container with clean saltwater for rinsing after the dip.
- Matched cutters, shears, a sharp blade or a saw, depending on the coral.
- Forceps for handling tissue or manually removing visible pests.
- Ceramic frag plugs, frag discs or small pieces of clean rubble.
- Reef-safe cyanoacrylate gel or suitable epoxy for mounting.
- Towels, eye protection and gloves.
- A frag rack or observation area where the new piece can be inspected.
Keep the containers clearly separated. A dip solution should never be poured back into the aquarium, and water from a container holding pests or tissue debris should not be used as rinse water.
Protect yourself, especially with zoanthids and Palythoa
Wear gloves and eye protection for all fragging. Keep splashes away from eyes, mouth and broken skin, and wash exposed skin promptly. Zoanthids and Palythoa require a higher level of caution because they may contain palytoxin. CDC reports that these corals produce respiratory irritants called palytoxins and has documented aquarium-associated illness involving respiratory, skin and eye exposure.
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CDC and FDA laboratory analyses reported 7.3 milligrams of crude palytoxin per gram of wet zoanthid tissue and 6.2 milligrams per gram in separate samples during the 2015 investigation. Those are measurements from that investigation, not a universal concentration for every zoanthid or Palythoa colony.
- Never boil, microwave or otherwise heat zoanthids or Palythoa. Heating can release hazardous material into the air.
- Do not scrape dry tissue, grind the skeleton or use a process that creates aerosols.
- Use gloves and eye protection, control splashes, and keep your face away from the work area.
- Work in a well-ventilated location and keep children and pets away.
- No single evidence-based hobbyist PPE standard has been established, so treat unknown colonies conservatively.
If material enters your eyes, contacts broken skin or causes breathing difficulty, stop work and seek urgent medical advice. Do not continue handling the coral to finish the frag.
Step-by-step: fragging and mounting a clone
1. Move the parent into prepared aquarium water
Place the colony in the work container filled with water from its aquarium. Keeping the coral submerged while you position the tool reduces unnecessary drying and lets you inspect the underside and attachment points. Have the mounting pieces and adhesive ready before cutting.
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2. Plan the cut before touching the tool
Identify healthy tissue and a section that can be separated without crushing neighboring polyps or destabilizing the parent. For branching colonies, select a healthy branch. For a soft coral, identify a section that can be cut cleanly and handled without tearing. For a massive skeleton, mark a controlled cut and make sure the saw and work surface are stable.
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3. Make one controlled, coral-specific cut
Use bone cutters or shears for suitable branching SPS or LPS. Use a sharp blade for soft corals. Use an appropriate saw for thick, massive skeletons, controlling dust and splash. Avoid repeated squeezing with a dull tool. The fragment must contain enough healthy tissue to survive, while the parent must retain enough tissue to recover.
4. Inspect the fragment immediately
Look for unwanted organisms, eggs, damaged tissue and loose debris while the fragment is still in the work container. Remove visible pests manually with forceps when practical. Inspection is not optional: a visually clean cut can still carry hitchhikers or eggs.
5. Dip only according to the product label
If you use a commercial coral dip, follow that product’s stated concentration, exposure time and agitation instructions exactly. Never mix dip products or improvise a stronger solution. Basting or gentle agitation can dislodge organisms when the label directs it, but weakened corals may tolerate dipping poorly, and a dip may not kill every egg.
6. Rinse in a separate container
After the dip, transfer the fragment to clean saltwater in the dedicated rinse container. This removes residual dip and debris before the coral returns to the aquarium. Do not use the display tank as the rinse container.
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7. Attach the clone to a stable substrate
Use reef-safe cyanoacrylate gel or an appropriate epoxy to attach the fragment to a ceramic plug, disc or small rubble piece. Follow the adhesive’s setting directions. Keep glue away from as much living tissue as possible while making firm contact with the skeleton or intended attachment surface.
Choose the mounting substrate deliberately
| Substrate | Best fit | Advantages | Limitations |
|---|---|---|---|
| Ceramic frag plug | Many branching SPS and small mounted fragments | Easy to place on a rack and transfer later. | May look artificial until the coral encrusts it. |
| Frag disc | Encrusting corals or pieces that need a broader flat surface | Provides more area for spreading growth. | Requires enough room and stable attachment. |
| Small rubble | Soft corals and natural-looking displays | Flexible shape and a less manufactured appearance. | Can shift in flow unless secured carefully. |
Mounting is complete only when the piece cannot tumble into another coral or disappear into the rockwork. A secure base also makes later inspection, quarantine and relocation easier.
Place and observe the new frag
Put the mounted frag in an observation area where you can see its tissue and attachment point. Avoid immediate extremes: do not shade it completely, blast it with flow, or place it so neighboring corals can sting or overgrow it. Adjust light and flow gradually according to the genus and the conditions in your system.
There is no universal healing schedule, PAR target or flow number for every coral. Recovery depends on genus, fragment size, the health of the parent, the cut, water quality, light, flow and the aquarium’s microbial and pest burden. Treat any published setting as species-specific guidance rather than a promise that a frag will heal in a fixed number of days.
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- Look for continued tissue coverage rather than recession.
- Confirm that the adhesive has not failed and that the piece is not rolling or being buried.
- Watch for pests, eggs, slime, unexpected discoloration or damage spreading from the cut.
- Move the frag gradually if it is being shaded, blasted or contacted by a neighboring coral.
- Keep suspect pieces isolated from the display until you can identify the problem.
Biosecurity: dipping is only one layer
A dip can reduce some hitchhikers, but it is not a guarantee that a coral is pest-free. Eggs can survive, and stressed or weakened corals may not tolerate an aggressive treatment. Biosecurity works best as a sequence: inspect, manually remove what you can see, dip according to the label when appropriate, rinse separately, and observe the fragment in a quarantine or dedicated frag area before distributing it or returning it to a mature display.
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Use separate water and tools for suspect material whenever possible. Do not return dip water, rinse water or visible debris to the display. If disease signs appear, isolate the affected piece and avoid moving shared equipment between systems without cleaning it.
Troubleshooting common failures
The cut edge is crushed or ragged
The tool may be dull, mismatched to the skeleton or being squeezed repeatedly. Replace or sharpen the tool, choose shears or cutters for a branch, and reserve a saw for a thick massive skeleton. Do not keep compressing a fragment that is already damaged.
The frag detaches from its mount
Check whether the substrate was clean and whether the adhesive made contact with a firm surface. Reattach the piece with fresh reef-safe gel or epoxy, then place it where flow cannot roll it into another coral.
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The coral recedes after dipping
The dip may have been too strong, too long or poorly tolerated by an already weakened coral. Verify the label procedure, avoid combining products, and give the fragment stable conditions in a clean observation container. Do not respond by repeating stronger dips.
Pests appear after a seemingly successful treatment
Dips may miss eggs or organisms hidden in crevices. Remove visible pests manually, isolate the frag and continue observation. Treat the dip as one step in biosecurity, not proof that the colony is clean.
The parent colony declines
Review whether the colony was truly healthy, whether too much tissue was removed, and whether cutting introduced contamination or excessive handling. Stabilize water quality and flow, stop further fragging, and isolate any signs that suggest disease.
A practical decision framework
Before cutting, answer four questions:
- What is the morphology? Soft tissue, a branching skeleton and a massive skeleton require different cutting tools and handling.
- How precise must the cut be? Use a blade or shears where a clean tissue or branch cut is possible; use a saw when the skeleton is too thick for controlled cutters.
- Which substrate supports this piece? Select a plug, disc or rubble based on the coral’s attachment behavior and the placement you need.
- What is the biosecurity burden? Plan inspection, optional label-directed dipping, a separate rinse and observation before the frag enters or returns to the display.
If any answer is uncertain, postpone the cut and improve the setup rather than experimenting on the parent colony.
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Fragging checklist
- Parent colony is established, healthy and not receding.
- Aquarium is cycled and stable, with appropriate light, flow, oxygen and relevant reef-water measurements.
- Tool matches the coral’s tissue or skeleton and is sharp and clean.
- Parent-water, dip and rinse containers are separate.
- Gloves and eye protection are ready.
- Zoanthids and Palythoa are handled as potential palytoxin hazards; no heating or aerosol-generating work is planned.
- Fragments will be inspected for pests and eggs.
- Any dip will follow its label exactly and will not be mixed with another product.
- Mounting plugs, discs or rubble and reef-safe adhesive are prepared.
- The finished frag has a stable observation location and will not be promised a fixed healing time.
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