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Hi... Sorry you lost your Severum. One thing stands out and it pertains to your test. Even in 200 gals with a light stock, it's virtually impossible to read zero nitrate. Unless you have killed your filters by cleaning the media. Do you mean all media or just the mechanical? But then you should have an ammonia reading if filters were dead. I suspect a bad kit or at least a bad test. Going forward, I suggest a far greater water change volume than 25%, and a frequency of far less than every 2 weeks. Think 75% weekly. Nothing but benefit doing large frequent water changes on a cichlid tank. There is more to water management than ammonia, nitrite and nitrate. Fish live in their own toilet. It needs a regular flushing.
 
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