I am in need of a clean up crew for my 20 gallon I will be moving it into a 40 gallon soon as it gets done cycling. I have nothing in my 20 gallon right now but, a few soft corals. I am wanting snails only for now. I want something to clean my sand from the diatoms that I got after installing two new power heads. Also something to help keep the glass clean. I only fed the tank coral foods at the moment. Any advise on my order would be great! Thanks.