Hi, I'm trying to control a parasitic outbreak in my tank and read several posts by an expert on here. Can anyone recommend one that would work for a 20 gallon tank? ( Preferably one that won't break the bank.
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Only choice is the Marineland polishing filter.
MarineLand Magnum Polishing Internal Canister Filter, For aquariums Up To 97 Gallons, 10.5 IN (ML90770-00)