I think, even though the urates will contain nitrogen, the amount of nitrogen compared to the amount of uric acid may not be worth leaving it in there. I don't think it will throw your pH off in the tank by any means, possibly just in the one spot - it's not enough to offset a tank. I know sometimes where a dog pees in the grass, the center of the spot will burn and kill the grass (the urea) and around it the grass will be tall and green (possibly the nitrogen/other stuff in the pee?) so there's both elements in play. If urates break down more slowly than urea though, it may not have the burning effect on the plant life. Maybe just bury them deep?
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