Is daily pH down(Nitric Acid) causing Nitrogen Toxicity??

I have to adjust my rez pH down to 5.5 from 6.5-7.5 once a day. I use Technaflora's pH down which is Nitric Acid. From my research, Nitric acid breaks down into Nitrogen for the plants.

I have leaf tip "hook" on my fan leaves. My EC is only 0.8-1.0 with no other signs of nute burn.

Any chance adding this pH down every day is raising the Nitrogen level and giving my plants slight N toxicity?

Thanks

Having to add Ph down on a daily basis doesn't sound right. What kind of nutes are you using? Notice any problems with smelly reservoirs or rotting roots?