Tank has now been hard-plumbed, leak-tested, and up and running for about a week using a Blueline 70 running a closed loop system: two Nu-Clear canisters with a parallel 584 Mazzei loop. CO2 injection efficiency with this much pressure is incredibly impressive. It took me a couple of days to properly seal the Mazzei to prevent it from sucking in atmospheric O2 and filling the tank with bubbles. I can drop the pH a full point in less than 45 minutes if I open the Mazzei full-bore. It's just amazing. With the Blueline 70 I have great flow and great pressure, too much of both unless somewhat throttled. I have no complaints at all about this pump on this tank.

I'm also very happy with the ADA P-6 17mm Lily Pipe Outflow. It delivers the water back to the tank very evenly from top to bottom, leaving no noticeable dead spots. And the surface skimming vortex it creates is equally great. I'll be the first to admit that I thought these things were high-priced toys for ADA fanboys until I tried them. I'm sold now, although I can do without the ADA glass intakes, way too small. If I tried to hook them up to the Blueline running this tank they would probably implode.

I will post some picks of the tank soon.