Clone Help! Leaves Getting Turnt Up

Hello RIO so I have searched the threads and can't seem to find something similar. I know some yellowing of lower leaves are natural but i have never seen new growth curl up and start to yellow.

I normally give them plain R.O. water without correcting the PH but this time i received some clones that were over nuted and decided to PH the R.O. water after doing so i started noticing this to my clones.

They are under a t5 12 inch bulb. Have a heating mat underneath them and are in Rockwell cubes. I have added no nutes to the water. The strain is Green Crack

Not sure what to do any buddy that has seen this and knows i appreciate it the help thanks in advance Clone .jpgClone 1.jpg Clone 3.jpg Clone 4.jpg Clone 2.jpg
 
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