I just added my yellow polyp colony to my nano reef tank which has been set up about 2 months ish and i was wondering if i need a protein skimmer. It is a 20 gallon hex with 20 lb live rock with a bio wheel with 200 gph and i have a 200 gph power head on the way to help with circulation. I'm all set on lighting and my coral seems to be doing great. I have read that you don't need a skimmer and also i have read that it is cheaper to just do water changes on small tanks. I want my corals to thrive not survive so which one is it?