leaves drying, curling upwards and twisting

Deep Water Culture

How long has this problem been going on? 6 days
Are you growing in a PVC grow tent? no
What system are you running? DWC, 1 gal buckets.
What STRAIN are you growing? Big Bud
What was the establishing technique? Seed
What is the age of your plants? 1 month
How long have they been in there mixture they are in now? 1month
How tall are the plants? 9 inches
What PHASE are the plants in? veg
What Technique are you using? no lst or anything, just growing
What substrate/medium are you using? hydroton, with small rockwool cube that I germed seed in
What is the Water temperature? 17-19 degrees celcius
What color are your roots? bright white
What Nutrient's are you using? 1 drop/gal Floralicious Plus, 5mL/gal GH micro, 10mL/gal GH bloom, 10mL/gal Botanicare cal-mag, 10 mL/gal botanicare aquashield, 1 mL/gal earthjuice mycorrhizae
How often are you giving nutrients? every other day
What order are you mixing your nutrients? the order listed, stirring after each addition
What is the TDS/EC/PPM you are using? 1.5 EC
What is the pH of the "Tank"? 5.5
Are you sure your calibration is correct on your equiptment? yes
When was your last watering? I top off daily, about 1L
When was your last feeding change? 2 weeks ago added aquasheild
How often do you clean your system? every other day
What size bulb are you using? 3 shop fluorescents with a 400w MH in cool tube
What is the distance to the canopy? fluorescents are within an inch, MH is 2-3 feet
What is your RH Factor(Relative Humidity)? I don't have a hygrometer right now but it is winter here so it is low, maybe 20%
What is the canopy temperature? no thermometer, probably 70 degrees
What is the Day/Night Temp? should be steady, lights always on
What is the current Air Flow? 400 cfm fan, also have a fan blowing near plant but not directly on it
Tell us about your ventilation, intake exhaust and when its running and not running? intake is through door, exhaust starts at cool tube and is directed through hole in wall out of room, always on
Is the fan blowing directly at plants? no
Is your water HARD or SOFT? no
What water are you using? RO
Has plant been recently pruned, cloned off of or pinched? no
Have any pest chemicals been used? If so, What and When? Neem oil foliar spray, about 2 weeks ago
Are plant's infected with pest's? no

The leaves are drying and curling upwards and then twisting. They are staying a shade of green but a bit lighter where they are drying. it is only the fan leaves and mostly the older ones but many of the younger ones are affected as well. I recently noticed another one of my Big Buds is starting to do this as well, I added a picture of its leaves so you can see what it looks like at first.
The third picture (42kb) is the good plant

You only need to give them nutes every week, and your EC seems a bit high for that small of a plant

ok, thanks

Yeah, its looks like your getting some lockout, I'd guess your having to much nutes and an excess of one thing is causing another to be completely locked up. I'd also say it could be from pH problems locking something out, but at 5.5 you should be perfect, what are you using to test pH, an electronic meter I hope, you cant get closer than a full point with drops/ strips.

Remember you cant repair the damage, just watch the new growth to monitor if you've corrected the problem.

I'm using a bluelab combo meter, best investment I've ever made, I also calibrate every couple weeks. I'll remember that the damage won't be repaired, and watch the new growth, thanks for pointing that out, I might've messed more stuff up trying to fix the unfixable

Just remembered to +1 rep you