Claw curling of leaves.

Greetings everyone.
I have a couple of problems, First and formost my plant problem. The plants are all the same as far as everything but their age.
8" pots, potting soil/perlite mix, lights 18 on/ 6 off floruscents 300w
Watering is based on weight of the pot. I try to keep them on the same watering times but it does not always work that way.
They are 2.5 months and 1.5 months old
8 older ones and 16 younger ones
4 of the older ones and it looks like it is spreading, whatever it is.
Ventilation is one concern the door open is not enough anymore. In the process of building my grow so not all is built.
Constant temprature is one as well, Due to poor ventilation the temp. fluctuates greatly.
Havent noticed any pest's and I am looking.
Nutrients have been a powder mix I got with my aero kit (not in use).
Just got my bc 3 part kit last night.
I flushed 3x the container size and all it did was slow it down.
I am ready to start the nutes back up to see if I can level everything off. Although I am new to this and dont know what the proper amounts of my hydro nutes to mix for the soil medium plants.(bc boost,grow,bloom)
I got these for my flood table and thought I would try them in the soil as well.
I am hopeing someone can help me I.D. the problem and get these girls up and going, I am ready to clone for sex and dont want to waist the time on the sick ones if I cant do anything for them.
Like I said "I am new here and hope I gave enough info, and thank you in advance for any help you can be."
I am haveing problems getting my pictures in this post.(newbie)
I did get the pictures to my gallery if you would be so kind to go there and look at them.

Clawing is usually related to overferting. You may also have the start of a nute lockout/salt build up so the flush was a good thing either way.

I'd probably wait on ANY ferts if it were me...and I'd focus on getting some general readings of the ppm and pH of the runoff water to determine if either of those are the culprit.

As far as the BC nutes..their website may have more detail..but usually if you are a soil guy and have hydro nutes you should either mix them 1/3 the strength of the hydro formula and apply EVERY watering...or mix the full dose and water with it ONLY every 3rd watering. I think it's easier to keep track of doing it 1/3 at a time..but that's just me. It's easy to over do these nutes...as you may be seeing right now...

good luck

bt dt

What is the N.P.K level of the ferts you used on them?
They look a little dry. and crispy, a burn of some kind.

The paperwork I got with the kit just told me to mix one packet of grow and one micro to six gallons of water. Thankfully I have learned so much since I got the first kit. I am not using the nutes any more, they have recieved nothing but clean water since I noticed the problem 10 days ago.

I'm in hydro and any time my leafs start to curl at the ends its always to much nutes.

Hi guys I am also having problems with claw leaf I will let pot dry out and test ph of soil