Hello all. I need some expert opinions. I have a 37 gallon fowlr right now. I plan on getting corals as soon as I upgrade my lighting. My question is, I have Hawaiian black sand as my substrate and want to know what bottom feeders would be a good choice. I had a sand sifter starfish which didn't work out well. Not really interested in crabs much. Is there a goby that could handle the larger size substrate? What other clean up crew is recommended? Thank you for your help.