Canister filters are a great way to go b/c most have three stages or compartments so you can do a prefilter, which cuts down on the large debris, a media, to promote a balanced tank, and in the third I would do carbon, which is a purifier. Stay away from hang on the backs and undergravel filters. Also, when looking at canister filters, look at the newer ones that have a self-primer. The nicer ones have these now and it's basically a button you push to siphon water into the unit, instead of having to fill the unit up with water and siphon with your mouth or pump until the filter starts. Trust me, I need a new one, and it's a beating with no automatic primer. Good luck.

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