I purchased a API pond test kit and tested the water in the morning and my ph was 5, ammonia 1.0, nitrate 0, and phosphate was 1 ppm, then I checked in the evening and the ph was 6.5, Ammonia 0, nitrate 0, and phosphate was 1ppm. The ph and Ammonia changed, do I need to change anything, water is real dark after fertilizing
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