The blue barrel is my sump tank, I have the pipes coming from inside the greenhouse and feeding inside this barrel. The IBC tote will be used as my fish tank. I will be covering the fish tank with 2" styrofoam to keep it dark and the fish happy...a pipe will be coming out of the fish tank and back into the pebble bed inside the greenhouse and from that bed the water will feed my other grow beds, then back into the sump tank, where the pump will be sitting. This will be the only pump in the whole system...