Good to hear!! I'd love to be able to increase N availability in my system but every time I add nitrates I get RTN! I'll give ammonia a shot.I used to get RTN when dosing nitrate. I tried switching from Sodium to Potassium Nitrate (USP) and then to AF N Boost with no success.
So far ammonia dosing has helped tremendously. I did loose a red dragon but it was due to a dino outbreak. I've been dosing 0.2ppm, which is enough to keep my nitrates at 2.5-5ppm and my PO4 at 0.03.