is the Fluval biolife any good? this is my first tank set up and I have had it running for about three months and I cant seem to shake this cloudy water. The filter/heater/pump set up is in a 30 gallon tank positioned in the recommended place at the end of the tank. I bought the tank and filter as a kit. I have performed all of the relevant filter changes and cleaning, any suggestions other than a UV steriliser?