yes I am planning on adding a yellow tang here soon. so I know some algae should be left for the tang and my angel to graze on. so my clean up crew dose not have to be too good. the other thing I am thinking of as far as clean up crew is detritus eaters. I know my options are limited in this dept. but I have read that searpant and brittle stars are good at this. also I read some sources that said the nassarius will eat detritus and others that said not. so far the ceriths seem like the best overall snail. do they stay on the bottom of do they clean the rocks and glass too? thanks again for all the info. is been a great help.