Trying everything I know help needed

So likely an N deficiency due to under-watering, the root systems are quite advanced and deep so the plants are most likely not getting the amount on N they need. I am currently hand feeding them when the lights come on with Phd water and superthrive. Ill add a 1 min feed to the cycle, so over an18 hours they get 2 x 1 min feeds and see how they go.
 
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