Help pls with flowering stage leves curling due to humidity loss?

My plants have been flowering for about 3 weeks or so and some of the top leaves look like they are wilting (curling up) what could be the problem? Please tell me
what you think. The 2 picture are of 2 different plants, one a bit worse then the other.




Light 12 on 12 off, 60 watt florescent lights, 4 lights in grow room with 2 plants.

Temperature is 70 I know it should be a bit warmer should I put a heater on in the room?

Humidity has been between 60 and 70 the entire time except recently it has dropped to almost 50 so I am thinking this is the problem? what can I do to add more humidity? I just put a bowl of water in front of the fan in there, is there anything else I can do?

Nutes are Schultz 15-10-15 (I stopped giving them nutes for a bit as I burned them awhile back but now I started giving nutes again mixed in when I water).

Soil is Schultz soil mixed with perlite.

If flowering want humidity around 50. Not much higher.

what strain is it,it looks to me to be ether heat stress or they are a bit sensitive to the nutes or you may have a ph problem.try just giving them just ph adjusted water for a few waterings see if you see a change
and remember that these changes dont happen over night it may take up to a week befor you see a change.good luck.

peace JEEP1

looks like you need MORE Light. Did you put into flower right from seed? Plant should be way bigger than that. Read, learn, grow

looks like over-water....peace

Yes was from seed, this is my first grow ever so I'm learning.