Starting to have an issue

[Caleb Calebson]

So this plant is in my 4x4 tent flowering with 3 other plants. And it has stretched quite a bit more. Not sure if this is due to light or something else? But it's starting to do this (look in pics)

5 gallon pot of coco+ perlite
Feeding 6 grams per gallon maxibloom + 1/2 tsp koolbloom 1x per day.

Mars hydro ts3000


Something is telling me it's the light doing it? I raised it but still looks like this.

 

[fauxnacho]

Any other signs of nitrogen burn like very dark green leaves or tips clawing downwards? Those few nasty leaves look nitrogen-toxic but if there's no other sign of it then it's probably something different!