Hello, I am new and in love with my saltwater tank! I have a 20 gallon with a clown and a snail and recently added a domino damsel (the clown and the damsel and best friends!). I know I need some clean up friends. I had an emerald crab before I upgraded but I think he died in a molt. I loved him but I am not sure he was helping to clean up much. I would like something more special than a hermit crab since I am limited in my quantity anyway. I am not a big fan of shrimp as far as looks go. Can I have a starfish? I just want to do this right! Thank you!!