It was a bad week...with a happy end!
I forgot to turn on the exhaust after i installed the bigger light + the weather was hot...the rez got to 33.5ยฐC...probably over 20h...
Roots went from white to brown within 24h..i thought everything is lost..plants looked aweful on top and bottom..
Just before all that i added first beneficials(TNC mycorrmax hydro)...they must have saved me...because just today i checked again and now i see loads of white roots coming out of the brown slimy coating...plants also don't look worse and keep growing healthy new tips
As it looks mycorrmax won the battle!