Please help identify problem

LED Light is about 2 feet above plant
DWC system using maxibloom noots

What's your water temp and pH?

PH was at around 5.8. Water Temp didnt seem too warm or too cold but i can check again later when im at the tent

Water Temp is 65 degrees and PH is currently 6.01

Looks to me like Mag deficiency, BUT I am new to it; only on my 2nd grow.