At this point I would repot them all in fresh soil. Get a good look at the root's on the sickest one, probably a sacrificial lamb though. What soil are they in? Did they germinate in that soil?
OMB Reviewed by OMB on . Ravaged by fungus gnats??? I started noticing gnats a while ago but didn't worry about them too much as it didn't look like they were actually damaging my plants. I was getting a lot of stunted growth but didn't connect the two. After a while the gnats got thicker and my plants started turning yellow, drying up and dying. Long story short, I read up a little on the gnats and went to war with them. First of all I keep two rooms. I've got one room for vegetative growth with a couple of t5s and a flowering room with Rating: 5