I am growing in rockwool and have managed to overwater after trying to flush out the nutrient burn.. This was due to my rockwool unable to drain properly in its container... The roots of the plants were crawling out of the bottom when i had the medium on flat surface... Now i have raised them up a bit so the wool can drain properly. The roots are now exposed to open air and obviously drying up and dying.... Will this affect the whole root, or only to the point where there is moisture? What other affects can i expect?