Possible nutrient burn?

Hi Everyone, having a first time issue that i think may be nutrient burn but not sure. Can anyone help.

I have an NFT system using Ionic nutes in a small closet with 450 led. Moved from veg to flower and still using mixture of grow and bloom (and some bud candy) but at like 2.4 ec even with much less nutes than advised. water is .5 to start and PH is 6 on the button. In hard water area and using HW ionic. Have sufficient ventilation and exhaust, although had to removed my odor can to bottom of cupboard to fit led rather than at top.Only new addition to my cupboard is a 450 led to replace my old HID (i had heat issues as its a closet)

I went away for xmas for three days and came back to find a lot of curling and drying (see pics) i moved lamp much higher now as it was like 6 inchs away about 18 inchs away now (its a new hi tech pro led not a shitty one)

Been in flower 12 / 12 for two weeks and no signs of any beginnings of flowering.

they are 4 big buddha blue cheese.

HELP? can't work out if its nutrient burn or some kind of deficiency or burning ( although its pretty cool in there. late 60's). NEVER had any issues like this before but lost as to whether its a deficiency or over nuting and if so what to do in an nft sceanrio

would massively appreciate your help. see pics.
 
Yea that looks like it could be several things,,just go through your check list..Air, light, water,. Flush and hit that reset button..good luck,
 
do you th8ink i should run it with plain water and if so how long? im happy with air and light juts cant imagine it is a deficiency if i am using good nutes right?
 
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