Photoperiod Yellow new growth during veg (RDWC)

[Boradan]

Sorry, updated the post
EC is 1.8 but was at 1.4 until a few days ago when I upped it in case of underfeeding.
Base ec of the tap water used is 0.4 (so mildly hard).
Recommended ec of Megacrop is 1.15 although it should be lower for RDWC as their recommendation is for soil, but this is also a PHOTOPERIOD so should need more than an auto.

 

[Boradan]

Plants now looking good on the Canna line.
I DID transplant one of the ladies from RDWC to a 20Litre (5 gal-ish) Airpot in coco/perlite as a backup in case I could not get the rdwc issues sorted out, but both are now thriving and flipped to flower a few days ago.

First pic I of the lady now in coco

This second pic is of the one still in RDWC.

Both are on The Canna line for nutrients
Cana Aqua for rdwc and Canna Coco for... erm... Coco...