IMO one is one too many but I have the population under control for now I have 3 critters that will munch on them Neon Goby, Lubbocks Wrasse and coral banded shrimp.
I don't like the looks of them and they are just plain old creepy but most people will leave them in the tanks due to their excellent detritus removal but on the other hand when they get too big they have been known to munch on coral.
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 My aquarium is nothing but a smorgasbord for my cats.....
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