yellowing 40 day old GDP

I have some GDP that are 40 days old.They are growing nicely except the fact they dont have the dark green color,there light green/yellowish.Ive been giving them Canna Terra,liquid karma,vegan compost tea,and recently dark energy.Any1 have any sugg for me?Am i doing somethin wrong??

what nutriants are u using

I mentioned the nutes im using in the og post.

anybody??By the way there outdoor in 20gal tubs.Do you think it could be because of the PH?I havent even checked the PH.I thought since there outdoors the PH problem wouldnt effect them???