I just got my fist tank, 55g. I plan on having fish only. It came with a wet/dry filter, and I bought live rock. I just bought a protein skimmer after reading that it helps take away waste products. But because I'm new I dont know if it was necessary to have both a wet/dry filter and a protein skimmer. I havent set up the skimmer yet. Should I take it back, or should I run both? Any information on the topic would be very helpful. Thanks.