Well before anyone trys to troll me. I do water changes every other day (50%) and my tap water reads close to 0. the reason I need to fix this because I setup a huge tank for my redtail and I'd like to fix It.. the current tank is a Bullhead catfish and a redtail. I feed once a day about 1-2 night crawlers per fish. As I said I'd like to fix it before. I move them to a larger tank. IV heard of plants in -hob filters. I'd like to avoid plants actually in the tank because we all know redtails would just eat them
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