My hydro plant leaves are turning brown tward the bse of the plant. What wrong?

[lukesmeds]

I just started my first deep water grow room/closet. I transplanted 1ft tall plants to hydro bubbler tank and followed all the directions on my Technaflora Hydro Kit adding all of the correct chemicals. Im thinking that my plants are getting too hot. so switched to a 12/12 lighting with 24hr fan flow to give them some cool down time. the tops of my plants look very healthy. but I am still on my first week. ARE MY PLANTS DIEING? CAN THEY BE SAVED?
ANY ADVICE WOULD BE GREATLY APPRECIATED
THANKS Y'ALL

 

[Spimp]

Can you pot some pics for us to see? Heres a link that should help: HOW TO POST PICS

Welcome to btw