I am using it on a 155 bow front tank. The return pump is a MAG-18 so I should have plenty of flow going throw my sump. As for the bio load / how long it has been set up, well that's a funny/ sad story. This tank is actually my fathers tank and I recently moved back in (temporally) due to just getting out of the Army and have taken over. He lost all his fish, corals, LR and LS due to the power outage from Sandy (all three of his tanks). After which all he did was drain the water and put new water in (left all sand, rocks, and dead fish stuff in there). It's been running since then with little fish and now has a decent amount of fish. He also pretty much never did water changes on the tank till I started doing them. His Nitrates are over 80 and even with water changes I can't really lover them. So long story short the tank has plenty of a bio load old and new.
The water level in my sump for my protein skimmer is set to 7" since I just made a new baffle for it at that height (it used to run at about 5" and he was wondering why it never produced...)
I just installed a GFO/ Carbon dual reactor from BRS today. While watching it run to make sure it wasn't leaking sure enough I seen a leak. It took me awhile to find the leak.... not coming from the reactors however, the drain bulkhead is dripping GREAT. I guess when it rains it pours... If anyone has any ideas for me without fully draining that beast that would be great.