[wet]

I've done this with Calcium Ammonium Nitrate (C.A.N.) but only induced greenwater, and I believe it to be my fault. At that point and with my amateur plant nerd understanding of chemistry I could not isolate NH4 uptake to plants, bacteria, or the greenwater, but N was gone all sorts of fast.

For those not aware but considering doing this experiment, remember to isolate N, by the way. For example, if I dropped about 10g of NO3 into my imaginary but awesome ginormous tank, I'd only need about 3g NH4 for the same dose of Nitrogen.