i clean the algae with a algae scrubber and a razor blade (watch your hands, my trigger bit me the other day) and when i fed them i make sure too get every piece of uneaten food as possible, i do put hermit crabs into my tank, just the blue leged hermit cause there cheap and the clean up stuff until they get picked off, iv noticed that they come out at night when the trigger is in his cave and they hide in the rock work during the day.