i need to choose a skimmer for my 55 gallon. I only have 90 but i will go up to 150. it cant be super big.I was thinking this one, also should my sump go skimmer,Bio-balls, refuge? or skimmer, refuge, filtration?http://www.drsfostersmith.com/product/prod_display.cfm?c=3578+4392+20033&pcatid=20033:huh::1zhelp: