[Funky_Fish14]

It looks like the BK's have a larger rectangular chamber underneath which allows them to have bubbles stay in the water longer, then it looks like theres some sort of bubble realease thing in the main chamber?

Well, the head pressure might bring it down to 700gph anyways, so that would still work.

I decided what I would like to do is go with a Blueline 800, with 700 or so gph through the sump, then a mag 5 on a closed loop.

Thanks,

Chris