I keep alot of clean up crews on my 180 reef tank never had an algae problem. until about a month ago, noticed empty snail shells, claws from emerald crabs and all my peppermint shrimp are gone and my cleaner shrimp. I have no clean up crew left.so I went out and bought. 300 snails 5 emeralds .again all gone. Turned out my red coris wrass was dining out on them. .doing water changes and Pulling out hair algae. ordered 200.snails but all I'm doing is feeding my wrass.he never did this before.had him for years.he is about 5 inches And now has a taste for shrimp, crabs, snails. Been using Vibrant. Still have algae . I also cant catch my wrass he is quick.. and to get away he goes completely under the crush coral bed. not sure what to do at this point..I never had to deal with algae but with no clean up crew its impossible to get under control.