Why are my feeder leaves yellowing?

[MasterDsKush]

Look at my set up all the other ones are bag seeds but the yellow one is “golden lemons”.
But anyway i have a 6inch cfm fan i forgot what one run it lowest setting bc it is to much but also running and HLG 550 v2 i know i can adjust i have it on the basic setting right now. Humidifier but can’t get it higher then 50 also got a carbon filter but i just want to show you guys my plants and see if you have any in put

 

[Beachwalker]

When seeds have sprouted its best to keep the dome off

 

[Burned Haze]

Looks like your letting the medium and root riots/similar product become too dry between waterings = thus making problems so many things . Answer for this = proper phed/temped water and the plants should start intaking again .

2nd tip: A vegroom RH should be 60-70% with lots of moving air on the plants . If you are lower than that I would definitely invest in a humidifier (don’t buy a shitty one) and get your Rh up, your plants will show the difference if you aren’t .