is this overferting?

there are two bottom leaves on my plant that look like this. i am not sure if its overferting or some kind of deficiency/mold/fungus because none of my other plants are showing these symptoms.

what do you think?

sorry for the bad picture quality

If I had to guess I'd say that it was a deficiency rather than too much nutes. I'm having a similar issue with my plant. How old is the affected plant? What kind of feeding schedule? It's not too uncommon for some leaves to turn yellow and die during the flowering stage. Yellowing of lower fan leaves are also a fairly classic symptom of nitrogen deficiency. I guess the more puzzling aspect is that only the one plant is affected, particularly if they're all the same age and have been treated the same. Post a picture of the whole plant, and give a little more info. Cheers.

From that horrible picture id would probably say lack of N. I would suggest flushing the soil to wash salt build up away.

based on a what i saw/read on some guide, i am pretty sure it is a Phosphorous deficiency. this makes sense because i have been pretty stingy with the nutes and these babies are already a foot tall. i am just so scared of overferting that i havent been giving them enough food.

should i wait til next watering to give them their proper dose or should i foliar feed them asap? i fed them 2 days ago (using fox farm growbig) and dont want to get root rot either.