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i have a 30 gall tank myself and im new to the aquariums and such but i still am experienced to some degree. what im tryin to find out is that my tank has a penguin biowheel filter ( yes with the activated carbon filter cartridge)! i remember u said carbon was bad? thats the only filte source i have and im not sure what to do if this is goin to overtime destroy the water quality. can u tell me some helpful additives for my water ( its fish only and sum inverts like crabs) and/or trace elements so my activated carbon filter doesnt deplete my water? please help - thank you!
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