Like platinum says....looks like burn from the blood meal man. That's strong stuff for such a small plant. Your temps sound ok, little high maybe, but generally ok. What's your R/H at?

You're using a good quality potting compost, so there's no need to give any additonal feed hardly at all during veg. They will feed off the soil, especially in a big pot. I only really feed during flower and just re-pot into fresh soil during veg. They will feed quite happily off fresh soil for 2-3 weeks, but they will tell you when to feed them. Don't just add nutrients for the sake of it.

Hopefully if you give the medium a good flush, the plant will recover ok for you. Good luck.