when i had 3 of these guys to take care of a algae bloom they were great. once the algae was gone they started buggin all the corals. amazingly i removed all of them from my tank by not cleaning one of my koralia's and let it get algae on it. once it was covered i found they would swim up there to eat it and once on the powerhead high up on my glass they didnt swim off just try and get away by climbing around and around the powerhead, made them real easy to catch.
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