sick plant's

Shes in pro mix light nutes t5

I had posted pic's in another topic. Having issues with plant's in FFOF since seedlings. It is day 50 from seed and I have noticed Nitrogen Toxicity. Some said yes and some say no. My PH is at like 7.2 but have not added any nutes except a couple drops of Big Bloom a few week's ago. I hate FFOF.