Deficiency? Nute burn? Lock out?

What is your water source? I'm wondering about the ph, ppm, and quality.

The downward clawed leaf tips are an indication that your soil may be too hot for them. FFOF is too hot for many seedlings but they usually grow through it. You haven't given any other nutes?
 
My water source is tap water PHed to 6.5. I fed with PBPB two times at 1/4 strength about a month ago, but nothing since. As for quality I live in a major city so I imagine not too great. Ppm, I have no idea
 
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