For me, because I'm starting a tank, I use mainly three test kit from api, Ammonia, Nitrite and Nitrate. These are I think the three basic indicator when you can introduce fishes into the tank. One more test kit I bought recently is ph, this juz an indication whether the ph of water is suitable for the fishes you want to keep. So you can make adjustment if you need to.









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. I got those kH, pH, Ammonia and nitrate when first join the hobby but only used once or twice. In my opinion just waste money

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