New grow needs advice please

I`m growing white dwarf outo fem in water and nutes with an airpump. one plant has leaves getting lighter and one has a skinny then fat stalk. i don`t know what to do. photo`s soon i hope. cheers

This might cover your leaf issue....https://www.rollitup.org/marijuana-plant-problems/431390-most-common-marijuana-plant-problems.html

i will say i have never ever had any luck with autos