This creature appeared in my aquarium a few weeks ago. Does anyone know what it is? It is the size of a quarter and craws around on the live rock. It appears to have several legs.
We found pictures of limpets that match this one so we do think that's what it is. Any id a if it is friend or foe for a tank? We couldn't find anything certain either way.
It's a keyhole limpet, alright. They are generally considered to be OK, although there are a few reports of the fleshy limpets (like yours) grazing on things that you might not want to be eaten.
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