With those temps u will have root rot in no time. Id change water immediately, and inspect those roots for rot.
U need to get the resevoir temps down, with an AC, better ventilation, or use less light if u have to but they need to come down today! If u dont get the res temps down those plants are gonners. Thats y I dont run DWC anymore. (Look into ebb and flow if ur new to hydro. Its dummy proof, with amazing results and no concern about resevoir temps..)
Getting ur res temps down to 70, 73F at the most and keeping them there, I cant stress this enough. Make sure ur res has plenty of oxygen pumped in also, plus use H2O2 every 3 days for the next ten to 12 days to fight off any chance of bacteria.