Hey y'all! I just ordered my first tank and i'm so excited to get into the hobby. I ordered an Innovative Marine 20 gallon Aio tank. I'm gonna do soft corals in the tank only and i would like to have a least a pair of clowns in there as well. Do i need to have a protein skimmer for a tank this size? and also, any recommendations on what other fish i could stock with 2 clowns as i've heard they can be aggressive. thank you so much!