ph problem?

from pictures i've seen, this looks like a ph problem. newer leaves are growing in all twisty and there are brown and yellow spots starting on the large fan leaves. its starting to spread fast and i dont know what to do. im using dwc, a 250 watt hps, fox farm nutes. i have two plants and the other one is healthy and growing great. just the one's giving me problems. ive been tryin to keep the ph around 6 but hasnt been staying stable. any suggestions?

Look around this link
https://www.rollitup.org/view.php?pg=faq&cmd=article&id=37

Could be PH have you been checking it? If so whats it been past few days?

How old? How much nutes? How close is the light? What's the temp at the foliage? What's the humidity. Not saying it isn't pH but you need to consider other things too.

Over feeding and stress can cause the twisting leaves.

i guess they're about 4 or 5 weeks old. the lights about 17 inches away right now and it stays a steady 70 F in my closet. not sure about the humidity. the one's ph just keeps dropping. i've fixed it twice already today and its only 4pm. i also topped them about a week ago if that might have something to do with it. this started like 3 days after.

Flush the res and start over. Don't check or adjust pH more than once a day, and try to do it at the same time every day. it swings naturally in a range and if you try to force it to a certain point it just swings wilder. What are the highs and lows you have seen? You need a temp and humidity meter, $6 at walmart. Your humidity may be way low, are you using heat in the house? If so try misting them and get that meter.