I've had a canister filter sitting in my garage forever.Last night I cleaned it up & finally figured out how to get it working, so I took the penguin filter off of my tank because it really wasn't doing the job and put on the canister, superb filtration, it started pulling stuff out of corners immediately and I was thrilled. Now today...I've noticed my eel breathing rather quickly & it made me a little nervous. Did I do something wrong? I took floss from the old filter and put it in the canister, ammonia & nitrite are at zero, is there something else I should have done? Did I screw everything up because I took off the bio-wheel?