I have a question about a clean up crew. I have had my tank up for a month and have two blue/green chromis that I put in a week ago. When would it be ok to put a clean up crew in? Also suggestions on type and number of clean up crew for a 20gal tank with live rock and sand?
IMO, don't add any clean up crew until you really get it going in a few months. It's counter-productive to add extra food to feed a new aquarium that has no algae or uneaten food. Plus, take it easy on the crabs. Been there, done that!