Help with plants leaves are twisting and veins are yellow

Hey i am growing big budd from ministry of cannabis .
Using a nft nutrient reading is at 400ppm in the 2nd week of growing . She has been looking fine but recently noticed the veins are turning yellow and the bottom leaves are curling down with light patches of yellow on them .
Nutrient wise i am using growzilla ( Nz product) superthrive and nitrozyme
.Any suggestions
Ph is 5.6
using a 400w mh light atm will switch when i put them into flowering
I read somewhere i need get some epsom salts?

Tried taking pitches but camera is not the greatest so cant see the veins or the patches on the plant
Some more pics below

well post pic ne ways looking at your leaves can help allot are your leaves cat clawing? your not supposed to give any food at all during the first 2 weeks of the plants life and make shure you only give 1/4 reccomended dose when you do feed if the leaf tips are bending down its nute burn how this help and post some pics man
much love
sticky

dude 5.6 is way to low if your growing in soil in soil ph should be between 6.3-6.8

stickyicky0420 said:

dude 5.6 is way to low if your growing in soil in soil ph should be between 6.3-6.8

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Using the nutrient film technique . so i thought the ph was suppose to be this low?

stickyicky0420 said:

well post pic ne ways looking at your leaves can help allot are your leaves cat clawing? your not supposed to give any food at all during the first 2 weeks of the plants life and make shure you only give 1/4 reccomended dose when you do feed if the leaf tips are bending down its nute burn how this help and post some pics man
much love
sticky

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Here you go dude have been given 1/4 nutes like i said the ppm is only around 400 when ( it recommends 1500ppm) are growing wonderfully .

Picnic101 said:

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Here you go dude have been given 1/4 nutes like i said the ppm is only around 400 when ( it recommends 1500ppm) are growing wonderfully .

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There is a simple way to handle situations like this in hydroponics. Whenever you have nutrient disorders, instead of figuring out what particular nutrient is causing the problem, just treat for ALL nutrients. I change out the reservoir and calibrate my PH meter.

Another thing to watch out for, if you are using tap water, sometimes it contains weird stuff that will lock out different nutrients in your solution. The cure in that case would be to get another water source, or an RO unit.

GreenThumbSucker said:

There is a simple way to handle situations like this in hydroponics. Whenever you have nutrient disorders, instead of figuring out what particular nutrient is causing the problem, just treat for ALL nutrients. I change out the reservoir and calibrate my PH meter.

Another thing to watch out for, if you are using tap water, sometimes it contains weird stuff that will lock out different nutrients in your solution. The cure in that case would be to get another water source, or an RO unit.

Click to expand...

Thanks dude will do a flush the change all the nutrients i think im lacking magnesium