What's wrong ?????

Hi , can any1 tell me what's wrong with that plant ? Why it's losing colour ? It's very light compare to the other one . Those are 12 days old fastberry auto from fast buds I'm using Adv nut. MGB , vodoo juice and b52 , the one I'm referring to had a little bit of nuts burn 4 days ago , and one day fan broke so the bigger one did get some heat burn , but generally they look happy , please help

That's the pics , all help very much appreciated

They are too little to feed. they need very little food to survive. Your in hydro , you control everything. lower the food waaaaaaaay down first.

Thanks mate , much appreciated