I've had my tank set up for about 6 months. It was set up for two years before I moved. All my prams are spot on. I can't tell you how many pounds of live rock I have, I honestly don't remember. I have 3 small fish in a 55g. Very few corals. My sump uses a drip tray and live rock rubble for filtering. I just want to know if I should spend the money and invest in a protein skimmer even though I'm not having any issues with my tank? If you think I should, then what would be the best in your opinion?