09-10-2007, 10:45 PM
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I also like the XP3 but have found that on a smaller tank, the XP2 is enough and is just as easy to care for. When I first got my XP3 I was worried about the right media because I had always usewd a HOB filter and was used to the typical regime. What I have found is that I can use almost anything as the medium for biologicals. If it has a surface, it will work as a biological. If it has fine passages like in a sponge or filter floss, it will remove solids. I have not added any carbon yet because I have not had any indication that I need it. The one very obvious feature of my canisters was not obvious to me until I reverted to a HOB for a smaller aquarium. I had forgotten what all the water racket came from until I had a new waterfall going on the back of a tank. The not so obvious feature is how quiet the canister is. They are also very flexible. If something fits in a basket of your filter, it may be filter medium or it may be useless but the filter will keep circulating the water through the rest of your media.