Wow just caught up with the thread. Tank looks great learned a lot about acrylic tanks and leaking bulkheads. Thanks for sharing the experience maybe when I get a monster tank if it is acrylic I will remember to test before I set up. As with your filter I am a big fan of K1's and the disks. K3's are just a larger version of a K1. If you decide to go with them you only need a 4 to 1 ratio meaning 1 ratio of the disk shape to 4 of the K1. and add plenty of air. Great tank so far and again thanks for sharing