Sounds like you're well on your way to getting the gnats under control. I'd say that is most of the problem, because even with the gnats dead, you still have root damage which will take a while to heal (if it does), or it could be permanent that causes eventual death. Really depends on how strong the plants/clone strain is and how well they can tolerate the root damage and how quickly they can regrow a (or grow a new) root system.

I had the gnat problem myself and realized it came from buying cheap dirt. Not to say Scott's is cheap.... I really have no idea on that one. I can say that since I popped for the actual miracle grow I have not had this problem. Something about the way they treat their soil. When I ran into this issue, a friend recommended NEEM oil. A little bit in a spray bottle with your regular water goes a very long way. Treat once a week, soaking the soil down with the spray and the gnats were gone completely after 2 treatments.

As for the continuing yellowing/leaves dying that would seem to be a factor of a poor root system. When I'm doing my clones, I put the cutting straight into water and leave them there until they get a nice, thick root system. I was using a rooting hormone to start with, but found out just the water by itself seems to perform about as well. Using just the water like I do may add a few days to the rooting cycle, but I've notice doing it this way seems to work best for me. Just my two cents!
KeiserSozeh Reviewed by KeiserSozeh 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