Hello Doug,
I still am in the process of building my refug setup and I figure if my nitrates are way off the charts I figure a good source of my problems were from the canister. I was only doing monthly maintenance on the canister and to be honest that thing is a bit of a pain in the ars to do weekly cleanings. Ive got power heads, bakpak, and a whisper2 for my filtration and things look good in the tank. I am doing a 5g change weekly to see if I can get this nitrates down. I check my ammonia and nitrite today. My canister has been off for a week so I wanted to check them lvl's to see if I had a change, to be honest I think my ammonia reading is better

ammonia and nitrite at 0. I figure with power heads and filter I am turning about 412 gph, I hope that should be efficient.