Photoperiod Northern Lights problem.

[bumper55]

Hello Everyone and happy growing, This is week 5 of RDWC growing of (2) NL photoperiod and (1) Jack Herer auto. The problem is one of the NL plants has stopped growing and appears to be drying up. I flushed the root system with RO/PH 5.6 water. The nutrients I'm using are Flora Series, Calmagic, GH SI, and Floralicious Plus (1/2 suggested amt.), with a total ppm of 375. I supplied pictures of the other 2 plants to compare. Could I have shocked the plant topping, the other plants appear healthy and the auto is showing pistils.

[Gingerbeard]

First suggestion is always give a few pictures.