I will take a shot at what is wrong.

If you used a recommended dosage of nutes when you first put those plants in the 6 gallans 3 weeks ago, I highly doubt it is a nutrient deficiency. I would guess it is an oxygen issue with the roots. I would guess that the water is over 70 degrees and you are using a smaller air pump. Is the one plant that is having the issue in the middle of the tub and the other two on the outside with the air stones directly under them? I would add air, probably double it.

You might as well just do a nutes change though if you think it might be a nute deficiency. That doesn't take much work and should be easy to find out if that is what it is.
Bachelorpads Reviewed by Bachelorpads on . Lil help finding out what's wrong with my baby, please? Hey all. Iā??m new to growing much of anything, much less weed, so I could use a little help if y'all don't mind. I tried soil and the fraggin' things would not grow for me. 3 months and the little buggers never got more than a couple inches tall, and then mysteriously died. LOL From everything I'd read hydroponics was suposed to be a lot easier. *shrug* It is too, because they're actually growing this time. I'm just suddenly having this little problem and as soon as I find out what it is I'll Rating: 5