12 day old Seedlings have been looking good but curling has started. PH of soil has dropped from 6.2 too 5.9. Thanks
A pic or two would help. 
It looks to be either wind or heat, Iām leaning toward wind. Do you have a fan right on it?
No. Only involved small fan 2 days ago and it is not blowing on plants using it for circulation. The temperature at plant level runs 75 to 78 . 2 days ago raised the from 24ā to 26ā.
Lights is what I meant by heat, you raised the lights because?
Light ir heat stress
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I had read about being careful about height and strength of light on new seedlings . After a week I decided to raise them from the advised height of 24ā to 26ā. I was worried about burning them. What do you think I need to do to fix the problem?
Nothing just watch the height, you already lifted it so you should be fine. Keep measuring and moving it
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The guys got you covered
If you are in soil I would try and bump my ph up to around 6.5. What is your rh humidity?
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Low humidity will cause them to curl. Raise your lights for 3-5 days. Also a lil calmag in your h2o right now. Itwill work.