Is this heat stress or a a problem with nutes.

what do you mean problem...how could you worry about any problems yet??? that plant barley came out of the dirt..don't worry so much you're like a overprotective mother!!!

lol ya your kosher maybe a little bit of discoloration from the water used to pop it that could be the yellowing around the edges but no big deal just keep you ph @ 6.4 youll be golden 90% of problems come from ph being out of wack youll be fine no stress

it could be your humidity / temp too whats your runtime temps at

I am being a little over protective, it's my first grow and I've already butchered 4 plants before I got one to grow. I think the water hovers around a 7, I need to get some vinegar to lower it just a bit, temps are right around 80 usually.

word monn best thing to do is go out spend a couple $ on a ph drop tester kit their really cheap like ah around 8$ where i am then when you crop go buy a ph pen they are key if you want to take growing seriously and actually achieve some quality yeilds.imo hope this helps

^^ what he said. they look fine.

collect a littel rain water untill you have your PH kit

(if its easy for you to collect .. continue to do so.. as rain water is great .. clean and PH neutral)

^ Unless you live in a industrial zone with chance of acidic rain.