Need help with claw type leaves ....thanks in advance

These plants are on 12/12 cycle . The 8th day of flowering . They. Are in fox farms green frog medium. Temp is between 70 and 80 most of the time.humidity avg 55%. The outdoor temp is fluctuating alot so some times my temps drop a little low and hit 65-68 . my ph is at 6.5 in the water and the soil I use purified water with humboldt organic grow nutrients. I have used some super thrive about 3 times moderately during veg . Total veg time was 56 days under cfl;s now during flower they are under a 600watt super hps horty blue. I sprayed neem oil dauly for about a week to stop a small amount of spider mites . I have been happy with the grow until now after 8 days of flower some of the lower leaves have developed the claw look . no yellow leaves . just a few claws . i am wondering if its a nutrient problem or a tempo problem or what . here is some pics you can see that most of the leaves look good except a few lower ones . the strain is green crack sativa. This is my first time growing inside .so any advice on my leaf condition would be very helpful.

is a pi wthe clac of

a pic of the overall grow

I could be way off base but looks like you're having a heating issue. Do I see a portable heater in there?

yeh i haz da same clawing same temp same humidity after all i've read i think its salts build up dunno if anyone can confirm that flushed for 2 weeks still there im using organic nutes also fish bone algue juice molasses

Roflicer said:

I could be way off base but looks like you're having a heating issue. Do I see a portable heater in there?

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Yes I have a heater because it's around 50-60 degrees outside my grow box at night . It has been tough to keep temps up when lights are out without sending the electricity bill up

Cant really see the tops of the grow that well in the picture but all the other Pics are towards the bottom where the heater is located. Just thinking Could it be the heater blowing on the plants doing this?? Is there enough room to position the heater so it is not blowing on the plants? Just a thought...

The leaves don't look to bad, just point the heater away from the girls, see if it gets better...

It doesn't look too bad, but It might be that you need to lower your humidity. do you have a ventilation system?

I have a hydro farm 6" daystar ac system with a 400 cfm fan . I also have another fan that is variable its a Dayton 3/4 hp industrial 10" fan that if I want to can cause a hurricane . I think that you might be right @Enzo I will try t point the heater away from the girls tomarrow when they are awake . Today they all looked the same they are not getting any worse and are starting to show some nice buds with a lot of white . They are still growing pretty good . I'm just concerned with any changes that happen because they have been perfect this whole grow . Don't want to make a mistake that I. Could have prevented asking questions

Enzogrowspot said:

The leaves don't look to bad, just point the heater away from the girls, see if it gets better...

Click to expand...

I changed the fans position and lowered the fan speed on the heater this has helped . I. Think the problem is from the heater

I agree, I think they got too hot. 60 or even 50 should be fine as long as the plant has some indica genes. Afghanistan gets friggin cold remember. And remember if your in soil that wont let the roots get to cold.