The tank has been running for 3 years?
Or you've had it for 3 years? How big are those fish?
What are you using to test and how old is the test kits?
What's your water testing at?
I would do larger w/c
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Been running for 3 years , I use API test drops , just got the kit 3months ago , ammonia 0 nirite 5.0 nitrate 60 I think , will a large water change harm the BB?
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