Tips of Leaves dying off

I am 33 days into flowering and my Master Kush x Skunk and SSH plants have brown tips coming from the new flower leaves. I have 7 plants in this room, they room has a heater that keeps it 70 - 74 on the floor when lights are on and it's set to stay at 74, it's usually 70 on the floor when the lights first kick on. These 2 plants are closest to the heater but the heaters been the same for 3 weeks and they JUST now are turning brown, a 3rd plant Dynamite is next to those 2 and not showing any signs.

Any advice?

Could be nut. burn

Hey bro, hard to tell without pics. What's your light source? How close are the tops to the light?

Working on pics...

4ft 8bulb T5 set up and the light is about 8 inches from colas, its just the very tips of newer leaves turned brown and curled up.

Sounds like nute burn to me too; need pix.

potpimp said:

Sounds like nute burn to me too; need pix.

Click to expand...

Ya me too, t5 usually don't burn