I've ran a 20 gallon nano with no equipment but a heater, light, return pump, and little pump for water flow and that's it. It has a $89 Sky LED from Petco that everyone tells me won't grow coral, then they see old pics of my tank and the Hollywood stunner puts on about a half inch a month, candy canes have all grown new heads. Anemone grew and split and both halves are doing great. Grows zoas and mushrooms like crazy and used to grow a Cali tort just fine till I killed it. My point is, frequent water changes, 10% every 2 weeks minimum is all you need. I have a pair of clowns, a foxface and a humu trigger, as well as a lawnmower blenny and a Ruby Red Dragonette. It had two clams as well but a certain filefish made sure they didn't live :( Sent from my iPhone using Tapatalk