06-06-2008, 11:04 PM
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For performance, silence, and ease of priming and maintenance, I prefer the eheim classic canisters. However, they can be pricey. I have an eheim wet dry canister too, and that is surprisingly quiet. Not anywhere near as easy to service as the classic canisters, though. I have a Magnum 350 that works really well, but makes a certain amount of rattling noise. This may be due to missing gaskets, though (I have replacements for the next time I clean it) or it may be due to the bio-media I put in the carbon chamber rattling. I also am running a rena XP3, but I haven't had it long enough to evaluate it yet.