Interesting maxalmon....I had 4 decide that they preferred the back side (outside) of the tank beter than the inside of the tank, got tired of picking them off and putting them back in the tank. .......my lfs told me that they like cooler waters, and most reef tanks are too warm for them. I have yet to have one live "in" my tank. I keep my tank at 80-81 degrees. Sticking with the turbo's, asterea, and margarite snails now.