this has happened on my 2 x nft trays

This happened on the other tray, I've tried everything, I thought it was sudden death syndrome on 1 plant then spreading to the next, obviously not its happened to this tray 2 weeks after it happened in the other tray..


I'm having 1 more attempt nd if all fails, converting the 2 x brand new gt604s into a Wilma system with clay balls, me mates been doing a comparison and the Wilma with clay balls with pump on 24/7 is looking better than the nft

Not a single suggestion...

????

I'd do my best to separate the roots, I've seen plants die from the dead roots of another plant.... weeks later. Good luck