How to Dip Corals Safely: Step-by-Step Guide
Every new coral should be inspected and dipped before it enters your display tank. A coral dip can dislodge mobile pests and clean the coral surface, but it does not reliably remove eggs and it does not replace quarantine.
- Use separate containers for the dip and final saltwater rinse.
- Match the dip product to the coral and follow that product's label exactly.
- Never add coral dip directly to your aquarium and never reuse a used batch.
- Inspect the plug, underside and skeleton for eggs because dips may not remove them.
- Quarantine after dipping when possible, especially for SPS, zoanthids and high-value corals.
What coral dipping does
A coral dip is a short treatment performed outside the aquarium. It helps remove or expose mobile hitchhikers such as flatworms and other small pests hiding around coral tissue, branches and frag plugs.
Dipping reduces risk; it does not make a coral pest-free. Eggs can remain attached to plugs, dead skeleton and crevices. A proper process combines dipping, close inspection, rinsing and quarantine.
What you need
- Two clean containers used only for aquarium work
- Saltwater from the receiving tank or freshly mixed saltwater with matching temperature and salinity
- A coral dip that is approved for the coral being treated
- Measuring syringe or cup
- Turkey baster or pipette
- Coral-safe brush or tweezers for the plug and exposed skeleton
- Timer
- Gloves and eye protection
- Bright light and a white container, or white material beneath a clear container, to make dislodged pests easier to see
Zoanthids and palythoas can contain palytoxin. Wear gloves and eye protection, keep them away from cuts, and never use hot water or create aerosols while handling them.
How to dip a new coral step by step
1. Prepare the coral before opening the dip
Dim the aquarium lights and float or acclimate the coral according to the livestock and seller's instructions. Do not pour shipping water into your display tank.
Check the coral before treatment. Look at the tissue, underside, branch junctions, exposed skeleton and frag plug. Photograph anything suspicious so you can compare it during quarantine.
2. Fill the dip and rinse containers
Fill one container with enough matched saltwater to fully submerge the coral. Fill the second with clean matched saltwater for the final rinse.
Keep both containers away from the display tank. Dip solution must never enter the aquarium.
3. Mix one dip exactly as directed
Read the product label before measuring. Concentration and exposure time differ between products, and a stronger mix is not automatically more effective.
Do not mix different coral dips together. If a second treatment is needed, use a separate batch and only when the manufacturer confirms it is appropriate for that coral.
4. Dip for the stated time
Start the timer as soon as the coral is submerged. Keep the coral moving gently in the solution. Use a turkey baster to direct water between branches and into crevices without damaging tissue.
Watch the coral throughout the treatment. Remove it early if it shows a severe reaction. Never exceed the product's maximum time.
5. Inspect what came off
Hold the container over a white background and look for moving pests. Check the coral again for egg clusters, bite marks, tissue loss or anything attached to the plug.
Dips may stun or dislodge adult pests but leave eggs behind. Mechanically remove visible eggs from hard, non-living surfaces without scraping healthy tissue.
6. Rinse in clean saltwater
Move the coral into the separate rinse container and swish it gently. This limits the amount of treatment solution transferred into quarantine or the display.
Discard both the used dip and rinse water. Do not return either to the tank and do not reuse the dip for another coral.
7. Quarantine and recheck
Place the coral in a separate quarantine system when possible. Observe polyp extension, tissue condition and any pest activity over the following days.
Repeat treatment only when the product label or a coral-specific treatment plan calls for it. Repeated dipping without a reason can add stress without solving an egg stage.
Which coral dip should you use?
ReVive Coral Cleaner Dip for general cleaning
ReVive Coral Cleaner Dip is a plant-extract surface cleaner intended for live stony corals, soft corals, zoanthids and anemones. It suits routine cleaning during acclimation and rinsing newly fragmented corals.
Use the concentration and treatment time printed on the bottle. Do not substitute instructions from another dip.
MedTec Live Coral Dip for a broad range of corals
MedTec Live Coral Dip is listed for soft and stony corals, anemones, mushrooms and zoanthids. Its directions call for 20 ml in half a US gallon of aquarium saltwater, with gentle circulation, for 5–10 minutes and an absolute maximum of 15 minutes.
The manufacturer also advises gloves and eye protection, forceful but careful flushing between branches, removal of visible eggs, and discarding the solution after one use.
Coral Power FW Dip for suspected flatworms on SPS
Coral Power FW Dip is a targeted flatworm treatment, especially for SPS. The listed directions are 1 ml per litre of aquarium saltwater for 30 seconds to 1 minute, followed by a separate saltwater rinse. Treatment may be repeated after seven days if required to interrupt the breeding cycle.
Do not use Coral Power FW Dip on Montipora species. This restriction matters more than convenience—choose a product approved for the coral rather than applying a one-size-fits-all routine.
Coral dipping mistakes to avoid
- Skipping the rinse: residue can reach sensitive invertebrates in the tank.
- Assuming every dip suits every coral: check species restrictions first.
- Making the mix stronger: overdosing can damage already-stressed tissue.
- Running past the timer: longer exposure is not safer.
- Reusing dip water: the used solution contains pests, mucus and contaminants.
- Ignoring the frag plug: plugs and dead skeleton are common places for eggs and algae to hide.
- Treating dipping as quarantine: a clean dip container does not prove the coral is pest-free.
- Dipping a severely stressed arrival immediately: assess its condition and use the gentlest suitable process rather than automatically applying the harshest treatment.
What to do after dipping
Place the coral under reduced light and appropriate flow while it settles. Avoid changing several conditions at once. Monitor tissue, colour and polyp extension, but do not judge recovery from the first few hours alone.
During quarantine, inspect the coral after lights out and repeat checks over several days. If you find pests, identify them before choosing the next treatment because flatworms, nudibranchs, red bugs and bacterial tissue problems need different responses.
FAQ
Should every new coral be dipped?
Yes. Every new coral should at least be inspected and treated with a dip approved for that coral before it reaches the display tank. Dipping lowers pest risk but does not replace quarantine.
Can coral dip go into the reef tank?
No. Mix and use coral dip in a separate container, then rinse the coral in clean saltwater before transfer. Discard the used solutions.
Does coral dip kill pest eggs?
Do not rely on it. Many eggs remain attached to frag plugs, exposed skeleton and crevices, so close inspection and mechanical removal from hard surfaces are still required.
Can I dip Montipora in Coral Power FW Dip?
No. The product instructions specifically say not to use Coral Power FW Dip on Montipora species.
Can I mix two coral dips together?
No. Use one product exactly as directed. Different formulations and treatment times are not designed to be combined.
Should I remove the frag plug?
Remove or replace it when this can be done without damaging the coral. Plugs and rubble can carry eggs, algae and pests that a short dip may not remove.
The safest routine
Dip, inspect, rinse and quarantine. Skipping any one of those steps leaves a gap: the dip targets mobile pests, inspection finds attached material, the rinse protects the receiving system, and quarantine gives hidden problems time to show before they reach the reef.