My tank has been cloudy for a couple weeks now, it is not a new tank, I have had it for a few months. it is 38 gallons and I use a Penguin 200 filter on it. However, lately the bio-wheel has not been spinning and I think that could be a reason for the cloudyness. Should I take out the filter pads (i use 2) and replace them, or clean them and put them back in the filter. I do weekly water changes, and have 0 ammonia so any suggestion, or tip will help!