Dammit. Hydro Tomatoes Crashed

I'm working on starting a business producing and marketing pesticide free vegetables, herbs and flowers to local consumers, restaurants, schools and stores.

I am new to hydro So I have a small nft hydroponic system set up that I built with 4"PVC, it has a 27 gallon res and I've been feeding foxfarm nutes, everything was going great..my tomatoes were just about perfect
hydrotom.jpg

and then started to flower, still looking good hydrotom2.jpg

Then a day later they just crashed, leaves were all wilted, felt really soggy, the whole plant looked like it was dying. I have no idea WTF happened. TDS was 1500, PH 6, res temp was warm as usual, it hangs at around 80. Two days prior I had started foliar feeding with bloom nutes because I have other plants in the system that arent ready for bloom nutes.

I pulled the plant and the roots were slimy, I suspect Pythium because of the high res temp. so I added some peroxide (3%) and that killed the algae in the system, I also trimmed back some of the dead roots but nothing is helping, lowered the tds to 1000, flushed a filled the res..i have no idea what else to do and if i can even bring the plants back from the brink..the flowers are still holding on though.

any suggestions?
 
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