Tips of Leaves dying off

[DQ Blizzard]

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?

 

[Capitalnuk]

Could be nut. burn

 

[Enzogrowspot]

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

 

[DQ Blizzard]

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.

 

[potpimp]

Sounds like nute burn to me too; need pix.

 

[Enzogrowspot]

Sounds like nute burn to me too; need pix.

Ya me too, t5 usually don't burn