Fresh2o
Aquarium Advice Addict
I would do 50% daily water changes for a few days to bring that ammonia down to zero. I think this is a combination of too many fish added at the same time with not enough beneficial bacterial (BB) and not enough water changes. Adding the ceramic media will help but you won't see benefits for several weeks (or however long it takes for the BB to become established). Don't clean or change the filter media. If you have to, merely swish it in the water removed from a water change.
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