08-08-2006, 05:35 PM
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The reason way I have 2 filters is The hang on the back filter has all the carbon and bio-wheels in it. The canister filter has a filter cart. which helpssuck up all the floating depris in the tank. As for the UV sterilizer the water stay's clear all the time, but the purpose for the UV is to kill all the bacteria, diseases, and algea in the water. It works excellent when you get an out break of Ick in your tank. If you are going to start up a reef system I would get one so when something of that sort happens you can control it. Because in a reef system you can not use much in medicating with the delicate corals and inverts.