So, I have always known my skimmer was a little undersized for my tank, and this is even more true now that I am growing so many SPS. So I am looking for ideas, reveiws, etc on a good skimmer for my system. I have a 120 gallon tank with a 55 gallon sump. Tank is mainly an SPS tank. I am willing to buy used or even money and trade for a good one. Things I could trade: Large Orange Crush Acan colony at least 21 heads visable in current location. Med rainbow acan colony (AE) with at least 14 heads visable in current location. Current skimmer- Aquaeuro USA RS-135 rated for 135 gallons. FTR I love the skimmer I have now, and it has always worked great in pulling out tons of crap (still does) but like I said, this would be better for a smaller tank.