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Oh, I never consider the conversion to nitrate. As you can see I'm new to this aquarium business. This might be little bit off topic. But if all the ammonia are converted to nitrate shouldn't the pH return to the original level, not lowering it? Nitrate and nitric acid are two different...

Not sure if this is helpful. The straight forward answer is the fishes caused the pH to increase. The fish excrete their nitrogen metabolic waste into their surrounding as ammonia. The ammonia is a base, or alkaline if you prefer. The pH of the tank will increase if you add base to it.