ID

super_glue_foot · 2026-09-22T16:45:46-0400

Does anyone know what this is? It was on my aquarium glass. Unfortunately this is the only picture I have of it

EnterName · 2026-09-22T16:54:16-0400

Looks like some form of sea slug, but I unfortunately can't tell you what kind. Most of them have very specialized diets and don't survive in reef tanks for long. There are a few beneficial ones (e.g. Berghia stephanieae that only eat Aiptasiidae) but there are also "bad ones" like Zoanthid-eating nudibranchs. If you see it again, I would take it out and make sure to take a few pictures from above. The back may help more specialized people like @ISpeakForTheSeas to identify it appropriately.

super_glue_foot · 2026-09-22T18:51:16-0400

EnterName said:
Looks like some form of sea slug, but I unfortunately can't tell you what kind. Most of them have very specialized diets and don't survive in reef tanks for long. There are a few beneficial ones (e.g. Berghia stephanieae that only eat Aiptasiidae) but there are also "bad ones" like Zoanthid-eating nudibranchs. If you see it again, I would take it out and make sure to take a few pictures from above. The back may help more specialized people like @ISpeakForTheSeas to identify it appropriately.

Thank you! Hopefully I can find it again!