2 weeks from seed. Nute burn? (pic)

First grow here. My baby is 2 weeks from seed. Indoor plant. I think it just hit true veg state. 300w overhead LED hung high at least 36"+ and two side 2' T5s at least 1' away on each side mounted vertically. Been watering every day to every other day. Was having some heat issues in the new grow box at first so it was evaporating fast. Think this is either nuteburn or possible root issues due to overwatering in 100+ temps. Temp has been ~80 F during week 2 of its life. Only nutes so far is fox farm big bloom .1-.3-.7 every other watering.