I currently have a 55 gallon. Sg 1.010. I have 3 monos, 1 evil orange chromide, and 6 guppies. ( I know I'll probably need a bigger tank for the monos someday.) I had my fiddler crab in there before I moved him to his own tank. Now my husband says I need something else, to sort of replace the crab. I think the tank is stocked enough. What does everyone else think? And if I add something what would I add? Some sort of bottom guy I guess but I'd like some input.