Is there any truth to canisters subjecting hobbyist to higher nitrates. I can see that happening if sponges and filter floss are left unattended only. I know air being exposed to a sump is good for beneficial bacteria and im losing that benefit in the closed canisters. should i sell one of the canisters and a get a sump, or can i get away with adding a refugium to the tank. (I dont have the space behind my tank..its up against the wall) Also, since I'm cycling LR soon, wont that be sufficient bio filt. in my 65g. Some on the net are claiming canisters are not logical for the reef tank. I dont want to get to the point of adding live stock and realize my filtration is inappropriate.