Yellowing leaves/tips 4th week of veg

Hi! This is my first indoor grow, I have 1 sour og, 1 grapefruit krush and 1 short rider. They're in a 32x32x64 grow tent with a 400 watt hps, I have an inline fan sucking in hot air from inside the tent. Anyways, sour og and grapefruit krush are 4 weeks and the shortrider is 3 weeks old. It seems all are experiencing the same problem! Here is a low quality pic.

have you started nutes yet?

No, I have not started using nutes yet. Also, the average temperature in the tent is 82 degrees. I am investing in a ph meter and some solution, next week.

when tips yellow at the tips, its sometimes means the plant is getting to much water. Dry the soil out and give less water. Another could be a small overdose prob. MY guess is over water.

Also forgot to mention, the light is about 3 feet away from the plants.

I give the grapefruit krush and sour og about half a cup of water every two days, and give the short rider a quarter cup every two days.

rules out overdose, under nurished doesnt seem to be the problem, typically when that happens the leaves go pale starting at the bottom and working it's way up. Picture still looks like over water. In your next transplant try adding a little more perilite for beter draining also make shure your pots will drain exess water out the bottom.

Thank you for the quick responses. I will definitely make sure to do that, Melungeonman. Happy smoking!

also what kind of light do you have hanging there, is that a chicken brooder light?

No sweat, hope some help comes of it if.

Some 400 watt hps light with a shitty reflector, but it'll have to do lol

Fourth week of veg, and no nutes? Plants may be cannabilizing, since you're not feeding them.

"Short-stacking" of nodes may be due to either nutrient deficiency or your pH being out-of-whack. Or both.