Hello, building a 20 gallon long for my 40 breeder softy/LPS tank. Conceptually, this is what I've come up with (see pic). I'm thinking a 7 1/2" water line, with a Reef octo NWB110, and BRS GFO reactor in the center chamber. I'll be using an Eheim compact plus 3000 return pump. The first set of...