question about a clean up crew

So i have a bowfront 180 gallon fowlr with a butterfly lunar wrass couple big damsels and a huge mimic tang, I have tried putting turbos in the tank before "added 20 in one day" 2 days later they were all dead, The lunar would knock them over and then they would all eat away at them. I have also tried sand sifting stars along with nassarius snails and nothing stays alive for to long, My live rock is now looking pretty bad any ideas on what i could put in the tank to clean up someof the algae on the tank? I have been so fustrated with the wrass that i have tried to catch him so i could get rid of him but no luck everytime i would put a trap in the tank he wouldnt come out and one of the other fish would end up stuck in the trap..