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hi everybody im new to this forum! i was wondering if anybody could tell me what size filter i would need to use for a 40 gallon breeder tank? i only have one turtle and he is about 4 inches long.

I would think that one that flowed 120gph would be needed. But typically you want to get the most filter your budget can allow, regardless of Tank size.

does anyone think this filter would be okay? Marineland HOT Magnum Hang On Tank Convertible Canister Filter

I never used it cause i like fluvals...But it does seem like a good filter by the reviews i've seen

Memp-29 Most are partial to canisters. For that size a 300 gph would be great. They are easier to clean and maintain. Try and stick to the 5x rule at least. I have a 350 gph on a 29 gallong and it does great. M.