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- Dec 10, 2025
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I just switched to a Forza FZ13 UV Canister filter from a Fluval brand, which was recommened by an aquarium store for my 55 gallon tank. Does anyone have any recommendations of changing the filters and how to go about it. When we switched to this filtration system, I think it caused havoc in my tank and a lot of fish died, maybe because there was no good bacteria. I just dont want to risk killing more. Should we soak the new filters in old tank water for a week or so or just put a new one in?

do not rinse the bio media in fresh water. You can gently agitate in som old tank water and put in new filter.
