I have a 40 gallon breeder tank with no fish except a cleaner shrimp and a small brain coral that came in on my live rock. I will add clown fish in about a month. I am just curious what is a good protein skimmer? I need a hang on skimmer because I do not have a sump. I would prefer a smaller skimmer but if I must have a bigger one that is fine. What are good skimmers?