Need help identifying issue

I'm 5 weeks into flower and several of my Blueberry and one of my OG Kush plants are having some trouble. This problem started this week and nothing in my watering routine has changed. Any thoughts as to what kind of stress causes this?

Is ther light leaking into the dark period?

Have you adjusted your light? I can see some of the leaves starting that taco roll and its usually from heat stress

Looks like you're too dark green, and the start of foxtailing. Its hard to tell with HPS lighting. Cut back on nutrient strength, and add a fan, pick up lights, or cool down tent.

I have revegged a few plants, looked just like #2.

using a 600w hps only. about 2-3 ft from the plants. This is my 2nd batch and this didnt happen on the last one. I'll get another fan and see if that helps. hopefully its not too late. i also hope it doesnt drop the potency too low. the only thing they get besides water is neptunes 2-3-1. Im going to use just water for a bit.

just an update: the temps have subsided down to 85 but the buds have no density