Aiptasia (Glass Anemone) Control in Reef Tanks
Aiptasia glass anemones multiply explosively, sting corals and are notoriously hard to remove because fragments regrow. Learn why they are a pest, the biological predators that eat them, and why a combined approach works best.
Why Aiptasia is a pest
Aiptasia (accepted name Exaiptasia diaphana, family Aiptasiidae, order Actiniaria; formerly Aiptasia pallida) is a small symbiotic anemone that is stressful to nearby corals and can even sting fish and desirable invertebrates. It reproduces asexually by pedal laceration — a single small fragment separated from the pedal disk can grow into a new anemone, which is why populations explode.
Why you cannot just pull them out
The polyps are notoriously difficult to remove: attempts to pull or scrape them off often create more, because new polyps regenerate from the remnants left behind. This is why manual removal on its own usually makes an infestation worse.
Control methods
- Biological predators: peppermint shrimp (Lysmata species sold as peppermint shrimp), Berghia and Aeolidiella nudibranchs (among the best Aiptasia predators), bristletail filefish (Acreichthys tomentosus) and copperband butterflyfish (Chelmon rostratus).
- Chemical injection or smother products designed for Aiptasia are, applied correctly, the quickest, cheapest and most effective single tool.
- A holistic, combined approach — biological control plus targeted injection — works better than any one method alone.
The copperband butterflyfish is one of the most effective fish, but it can take patience to find an individual with a taste for Aiptasia; captive-bred bristletail filefish are inexpensive and generally considered reef-safe.
Sources: en.wikipedia.org (Wikipedia, CC BY-SA 4.0); reefbuilders.com ; www.marinespecies.org (WoRMS)