Their both in dwc, so it can't be overwatering. Although it does look similar.
My theory is she started to get root rot really early, as I stupidly used old air stones. Which have now been replaced, everything sanitised, and a new fresh solution of feed.
When I look at the roots, the older ones have stopped growing and are not producing off shoots.
There is a small glimmer of hope, as there is a few new sets of healthy roots growing. But my fears are I have done too much damage too early for a reasonable yield.
I plan to wait until new year and if she bounces back I'll keep her. If she still looks like poo I'm gonna cut my looses and get and new seed popped