Hi all, I recently made the decision to upgrade to a canister filter (Penn Plax Cascade 700). Set it up yesterday morning and my tank is already looking miles better! It did not occur to me during set up to put the cartridge from my old filter (Penguin Bio Wheel) into the cannister, so I will be running both filters for a while. My question is, how long do you think it will take a sufficient biological filter to establish in the canister? I could always run both filters until first maintenance on the canister and move the media over at that point, but I don't know if that's beating a dead horse. Any help is appreciated!