Plants look like there discolored and yellowing

Hello I’m wondering if anyone could help me figure out why my friends plants look they way they do. ???? I appreciate your time thank you ! The soil is promix cut with perlite and some black and gold soil. It’s in a 2..5 gallon pot and has a blurple led light above it. Temps are anywhere between 78-85 depending on the weather and have been fed once with some roots organics veg nutrients. I belive the last few waterings have been plan water ?

That's a nitrogen deficiency. Feed with a growth regimen

Disagree, nitrogen deficiency would be starting with the bottom leaves and making its way up, yours look the opposite based on photos. To me this looks most like a sulfur deficiency (try an Epsom salt foliage feed). Also a bit overwatered?