Pretty much this right here, i do 80% water changes, +1 Prime.Prime and Safe ( dry Prime) turns ammonia into ammonium, which is non toxic. It gives your bio filter 48 hours to process it into nitrates. If you do large waterchanges you need to worry about ammonia being released by chloramines. I nearly killed a tank of fish years ago thinking my filter would handle the free ammonia. I no longer worry about it as my water uses free chlorine.
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