DWC Yellowish leaves...

So I started a DWC and it's about 3 weeks in.. My plants are humongous! They started out yellowish though, they are freebie seeds... But I am not sure why they are yellow.. They started yellow.. And they have become massive, yellow. They look extremely healthy from Root to leave.. But they do have a yellowish tint to them... Ph 5.8

Can't help without pics friend, but I can say the appitimy of a healthy mj plant does not involve the word yellow so there is deffinetly something wrong, what nutes are you using?

I will get pics up tomorrow when my lights come back on. I am using Optimum Hydroponix complete set up..

Without pics its hard to say, but could be a nitrogen lockout or lack of nitrogen, or maybe u need calmag as a lot of nutes are lacking. Just a guess though without pics.

up the veg nutes.