80°f is that to hot or am I to close

I have been using the fox farm 3 combo deal.I cut it by half as I have autos.I have used no more than 1tsp of each in 1gal of water.that's why I thought environment not nutrients.I will use just h2o for a week and see.my run off is 6.0 and I always check the water ph6.8 if that helps narrow it down.

Looks to be too much nitrogen, with how she is clawing down and a darker green in colour

The day temp is alright, heat stress begins at 29 C. If possible bring the night temp to 20 or 22 Celsius it would be great. Check instead the light to plant distance, in accord with the manufacturer's instructions. Also could be you water too often and the substrate has no chance to dry a little witch leads to root problems that reflect pretty much like this on the leafs.