nft problem please help !!!!

nft 424
week 2 of grow

nft pump on lowest setting 424

vitalink nutes a and b grow and bio pack and plus and liquid oxy and silicone

ph at 5.5 ec at 1.4

water temp 19c-20c
leaves curling from the botton of the plant up , i will upload more pics asap ........ cheers

Your roots are rotten

Gotta get those temps down

Thar aluminum foil is a killer from what Ive heard. That may be the problem, the foil magnifying the light up to the leaves and burning them almost like a magnifying glass in the sun. I may be wrong but Im going on research and other growers experience with aluminum foil.

Its silver tape not foil and what temp shud it be and cheer