After reading your journal its become even more difficult to attempt to decipher your situation.
You have gone from a living system to a sterile one (which I see as being a possible issue). You had light leaks in a few of the modules themselves, which in turn allowed algae to colonize in your roots (some types of algae are harmful, some are not).
Then you washed the roots of already stressed plants by hand in tap water and h2o2 and added Physan.
Bottom line is the original issue (on 12-28) whatever it was, has become a compound problem.
Due to the fact that you made multiple changes, its gonna be rough for anyone to tell you whats wrong at this point. Chill out and watch them for a week, maybe some weak Foliar love like
Nitrozyme with a bit of cal/mag and some saturater. See what they do, if you have the patience to nurse them back slowly I think you will come out of this with a better perspective on things.
EDIT:on a side note 240v is the way to go. For future reference remember ohms law; watts divided by volts will give you amps, just add 15% for safety. ex. 2000w/240v=8.3amps+15%=9.583amps () 2000w/120v=16.6+15%=19.16
FJ