Whats with these leaves? Pics.

This is an almost 3 week old feminized vanilla kush plant in soil under 1 40 watt cfl on 24/7.

The last couple days it has developed minor burning on the leaf edges. I am pretty confident it is not nute burn because I have only fed it once using a very low dose of neptunes harvest.

anyone know what it could be? I was thinking maybe heat stress because I have no fan in my veg section, only in the flowering section.

I also have a magic bud plant, same age, same conditions and it is doing great, no problems what so ever.

Thanks in advance

Without some air circulation,you will have alot of evaporation on the underside of the leaves and clogging the stomata.Can't breathe.. Pluck the lower fans closer to the soil,should work for ya.:thumbsup: