Ammonia Nitrate pH

Ok, so put it simply there are two processes going on with the fish urine (mainly ammonia):

1, NH4 to NO3 (done by nitrifying bacteria)

2, NO3 to peptides/proteins (done by algae and certain bacteria)

Without algae, NO3 accumulate very fast, so in water there are a lot NH4 and NO3, and they "neutralize" each other resulting in pH in the range of 5 - 7.

If we let algae grow, NO3 is depleted fast while some NH4 remains due to slow process of nitrifying bacteria, hence there is not enough NO3 to neutralize the NH4, resulting in pH higher than 8.

In this case, I wonder if there's any way to increase the speed of NH4 to NO3 conversion? Maybe increase the amount of nitrifying bacteria?

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When NO3 further accumulate, the pH even drops below 5.

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