I veg my clones in 3"net pots in a mister system for 5 weeks and them transfer to a NFT system for flowering. I have been very successful with this system for 2 years . My problem is now when I transfer to the NFT systems the plants wilt and have symptoms of root rot. This has happened 2 times and I cant figure out what the problem is. I meticulously clean after each harvest the whole NFT system, I use water chillers in the reservoirs 70degrees I use 1/2 strength nutes for the transition phase 8-900ppm, the mother (super silver ) is robust and healthy the room temp never exceeds 80degrees f . I am at my wits end. Do nutes go bad or can they cause root rot?