I just finished plumbing my second tank, a 50 gallon one mainly for frag propagation. I got the bulkheads at the frag swap, and all else from Lowes (took ONLY two trips! hehe). I bought a Poseidon external pump and can't believe how quiet it is... I literally don't hear it, and can barely even feel it vibrate. It's output is so great that I've got to turn it down with a ball valve. That pump plus two sea swirls should keep things stirred up. I may add the modified Maxijet 900, we'll see when I get things set up!