How to Get Rid of Aiptasia
🐠 The short version: never crush or scrape aiptasia — fragments regrow and it multiplies. Kill individuals by injecting the mouth (pumps off). For real infestations, Berghia nudibranchs (aiptasia-only specialists) are the most reliable fix; peppermint shrimp are a cheap gamble (species and individual vary). Then prevent it: inspect and dip every new frag plug and rock. Persistence beats any single silver bullet.
🔧 A specialist for a specific pest is one job of the cleanup crew — but aiptasia needs the right predator, not just any shrimp.
What aiptasia is (and why it’s a pain)
Aiptasia (glass anemones) are small, hardy pest anemones that reproduce fast, sting and outcompete your corals, and are genuinely hard to eradicate. The single most important thing to know: damaging one makes it worse. Scraping or cutting leaves tiny fragments that regenerate, and a stressed aiptasia can trigger a survival response that spawns several more. So the rule is kill it cleanly in place, or let a specialist eat it — never crush it.
Biological controls — what actually works
- Berghia nudibranchs — the specialists. They eat only aiptasia and systematically hunt down every last one, which makes them the best answer for a bad infestation. Two honest caveats: once the aiptasia is gone they starve (rehome or pass them on), and peppermint shrimp and many wrasses will eat Berghia — remove those predators first.
- Peppermint shrimp — a cheap gamble. Some are excellent aiptasia hunters; many aren’t. The reliably-validated eater is Lysmata boggessi, but shops sell a mix of Lysmata species — and sometimes camel shrimp, a look-alike that will happily eat your corals instead. Results vary by individual, and an underfed peppermint may nip corals. Worth a try for a light infestation; not a guarantee. See the shrimp hub.
- Copperband butterflyfish — inconsistent. It can pluck aiptasia from crevices, but success is hit-or-miss, it may nip corals and clams, and it’s a delicate, easily-stressed fish. Not a reliable pest solution for most tanks.
Killing individuals — the injection method
For a handful of aiptasia, inject each one: turn off your pumps (so nothing drifts), then use a syringe to deliver a killing solution — a commercial aiptasia product or a kalkwasser (calcium-hydroxide) paste — straight into the mouth/oral disc. A clean, complete kill is the goal; a half-killed, stressed aiptasia can retract and spread. Aim carefully, and expect to repeat over a few sessions.
Prevention — the part that actually saves you
Eradication is hard; keeping it out is easy:
- Inspect every frag plug and rock base under bright light before it enters the tank — aiptasia hitchhikes on both.
- Dip and quarantine new corals so a pest arrives on a plug in quarantine, not your display.
- Keep nutrients balanced. Aiptasia thrives on excess — sensible feeding and nutrient control slow it down.
The honest takeaway
There’s no one-click cure. Match the tool to the scale — inject a few, unleash Berghia on many, treat peppermint shrimp as a bonus not a plan — and above all stop crushing them. Then close the door with frag-plug inspection and dipping so you’re not fighting the same battle next month.
Sources & further reading
- Coralkin — Beating reef tank algae & pests — where pests fit in the bigger husbandry picture.
- Coralkin — Cleanup crew guide and shrimp hub — the specialists and their honest caveats.
- AlgaeBarn — Peppermint shrimp (Lysmata boggessi), algaebarn.com — the validated aiptasia-eating species vs look-alikes.
- Saltwater Aquarium Blog — Berghia nudibranch aiptasia control, saltwateraquariumblog.com — dosing, timeline, and the shrimp/wrasse warning.
- Reeflabs & RateMyFishTank aiptasia guides — why crushing backfires; injection method.
Common questions
Why does aiptasia keep coming back after I scrape it off?
Because scraping or cutting leaves fragments, and aiptasia regenerates from them - damaging one can trigger a survival response that makes several grow back. Never crush or scrape aiptasia in the tank. Kill it in place (inject it) or let a dedicated predator eat it.
Do peppermint shrimp eat aiptasia?
Sometimes. Results vary by individual, and the shrimp sold as peppermint are a mix of species - the scientifically validated aiptasia-eater is Lysmata boggessi, while look-alikes (and the camel shrimp often mis-sold as peppermint) may ignore aiptasia or even nip corals. It is a cheap first try for a light infestation, not a guarantee.
What is the most reliable way to remove aiptasia?
For a bad infestation, Berghia nudibranchs are the specialists - they eat only aiptasia and hunt down every last one. For a few individuals, inject each one. There is no single silver bullet; persistence plus prevention is what actually clears them.
How do I inject aiptasia?
Turn off your pumps so nothing drifts, then inject a killing solution (a commercial aiptasia product, or a kalkwasser/calcium-hydroxide paste) directly into the mouth/oral disc with a syringe. A clean kill matters - a stressed, half-killed aiptasia can retract and spread instead of dying.
How does aiptasia get into a reef tank?
It hitchhikes - most often on coral frag plugs and new live rock. Inspect every frag plug and rock base under bright light before it goes in the tank, and dip/quarantine new corals. Prevention is far easier than eradication.