Help my plant is suddenly dieing
 

just 2 days ago i pulled my beautiful green plant, that had been sprouting new leaves like crazy, out of the fog chamber to take a quick glimpse of the roots through the net pot. they were beautiful bright white and fuzzy, except for a couple long ones which have been brown for a while. i plucked the brown ones out and put the plant back in the fogger very satisfied. the plant looked fine yesterday as well. today i went in and saw that the first 2 leaves were brown and dried out, and the newer leaves werent looking to good either. i pulled it out and saw that the fuzzy microscopic roots were gone and the roots were no longer bright white, but brown. i checked the fog and there was plenty of fog getting at the roots. i checkd the temperature of the water, it was 78. the water temperature has been around 73-78, the ppms have been around 400, the ph has been between 5-6.5, though today it was 6.8. air temp at the plant has been 84 constantly. what on earth happened? pics attached.
https://forum.grasscity.com/attachme...1-jpg.2218717/
https://forum.grasscity.com/attachme...9-jpg.2218716/
https://forum.grasscity.com/attachme...2-jpg.2218718/
https://forum.grasscity.com/attachme...1-jpg.2218717/
https://forum.grasscity.com/attachme...9-jpg.2218716/
https://forum.grasscity.com/attachme...2-jpg.2218718/

What is a fogger? I am not joining your forum. Go away troll