post a pic of this, nute burn usually wont twist/turn leaves. unless its really bad.
What does your DWC system consist of and what dose strength are you feeding them??? Most important thing is keeping the pH @ 5.8 and the water temps low.
id add in just about every nutrient. not too much N, and a healthy dose of everything else, including mucro nutes. that leaf rip... i dunno, could be just a rip... but if its on a lot, check for bugs, and keep checking ph.
well if you have too much, dont flush, just dont add more. and if you dont have enough... add more. i doubt you have too much.
This is a Calcium deficiency. This was NOT caused by lack of Ca in my mix! I'll explain in a sec...This deficiency was caused due to a lockout! My Ph in my DWC set up rose to 6.2 for a couple days 
Calcium will get locked out in Hydro above 5.9 and in soil below 6.4 If I would have added additional Ca to my system,I would have created a toxicity! Therefore making matters worse! Before adding more Fert. to treat a deficiency be sure you are checking your Ph levels also! At the first signs of a deficiency,correct your Ph if needed FIRST!...THEN add more fert if NEW growth is still affected. Once a leaf is scarred it will NOT heal! I've seen posts where people expect to see the damaged leaf heal,and when it doesn't they continue to add more fert! BAD! 
well at 6.4 you can be locking out a lot of other nutes. i wouldnt go as far as to say thats also low on PGreat Thread and postings here..Thanks! Just thought I would add some Pic's of my own..Hope these can help.View attachment 2203141View attachment 2203144View attachment 2203147 This is a Calcium deficiency. This was NOT caused by lack of Ca in my mix! I'll explain in a sec...This deficiency was caused due to a lockout! My Ph in my DWC set up rose to 6.2 for a couple days
BTW I am using AN sensi bloom A/B. It already has Ca in it! A/N recommends(on a DWC setup) topping off the res with 100ppmCal/mag(r/o water) which I do. That is why I know it is due to a lock out(plus my Ph reading was obvious!). Thanks for letting me throw my 2 cents in...Grow in Peace!!
ok, pics 1 and 3 are the same issue, the first is severe, the 3rd is moderate. am im thinking it could be a mix of a N def, and some potassium. your pH is kinda low and could be blocking out the nutes, so i wouldnt add anything for a bit. id get some 7.0 buffer from a pet store for fishtanks and add that to all the upcoming feedings til your closer to 7 in the run off, try dolomitic lime too, but the issue is thats easier to use before the grow, and not during (i got some that were pellets, and they worked great but a hassle when already in dirt).
Im growing in Soil in a 40" x 40" grow tent with a 400 hps light. Let me know the best way to make it to harvest with most of my crop intact
well you got all sorts of issues going on, if you cant get a pH thing, then your gonna have to play it be ear
um... get a timer, and stop moving them around. put them on a 24/0 schedule or a 20/4 or maybe 18/6... anyways, add nitrogen, add micro nutes, and a little P and K. check PH and you should be fine.
Ok will do thanx a lot!
then start curling at the tips like this
then keep getting worse 
well without knowing the pH, its hard to say if thats pH burn or nute burn. if you cant get a pH kit, or a 6.5 or 7.0 pH buffer from a pet store for fish tanks, then mix your nutes, and add a little lemon juice. its risky, and the lemon´s pH wont alter the pH of the soil much, but it might help
