is this nute burn or a deficiency please help

hi i have these 3 lsd in a nft for about 5-6 days and they are not loooking too good
my ph is a steady 5.8
my base ec is 0.5-0.6 so i added nutes to make it 1.0-1.1 but over 4-5 days it has risen to 1.5-1.6 so this is what makes me think its nute burn but i cant be sure i've checked the stickys but cant deicide what it could be please help heres some pics

nute burn it is

Ok how should I go about sorting this should I feel tank with plain ph water or a weaker feed?

don't feed for a while. less is more. i feed maybe 3 times in veg

Definitely nute burn.

Ok they are in dark now for another 4 hours should I change res now or when lights due to go on? Thanks 4 the help

BeanZyBoo said:

Ok they are in dark now for another 4 hours should I change res now or when lights due to go on? Thanks 4 the help

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What nutes do you run? 1.1 is a bit high for NFT. Perhaps try keeping EC around 0.6 for veg and 0.8 for flower.

It also looks like your plants are showing a bit of a nitrogen deficiency. Maybe your high EC has locked out the N.

Yh that's what I was thinking