The tank has been set up for about a year and half. The corals have only been in for about six months now. Most are medium sized frags with a few smaller colonies. The tank has a corner overflow, so the rock work is built up near the overflow and then spreads downward toward front and other side of tank (hopefully this makes sense). I am using two Tunze 6040 and two Jebaos pp8, but want a more reliable and stronger pump for long term success. The Tunzes flow the water from front to back and the Jebaos are creating a standing wave in the tank.