I have 18 gals 13 days in 12/12. 3 of them are turning a light green/yellow. Not just a few leaves here and there. Everything green is lightening up. Would it need a little veg nutrients? Or what. Never had plants do this on me. I burnt a diesel throwing a little veg nutrients, maybe it was too much... Helps/advice is appreciated. I have been looking into it for two days now.