Help sick og plants

I have one og kush 6 og platinums and 6 og Tahoes. They where doing good this is only my 2nd grow. Last grow had alot of bugs this time I sprayed azamax but I heard og doesnt like azamax. So I stoped a couple weeks ago. I am growing in coco with AN nuts they looked good till my last spray of azamax. But I also put about a 1 1/2 of sand on top to stop root nats. Then they are starting to go down hill. I took the sand out the other day thinking they were getting root rot from not being able to dry out. But still going down hill. Original og is the only one that looks healthy. 1500ppm nuts 1200 co2 and 2 600w hps. Can anybody help. Im going off AN chart connoisseur grandmaster level. I cant find any bugs. Oh and adding cal mag half strength. R/o water at 5ppm. The first pic is the original og. 2nd pic top left is the sickest plants. The only one that is doing good is the original og. Ive flushed about a week ago. And last night I added epson salt 1tbl spoon to 4 liters of nuts. Im watering to wast. Please help

Sorry to see things going downhill.. OG plants are crazy finicky. You gotta be careful what you do and be patient. If they are reacting poorly to the azamax then you can't do anything except wait. All said my humble opinion is that you are changing too many things, too often. Good Luck.

Ok ill wait it out and hopefully they will bounce back but if not I have the next group vegging now. Have you heard of promis bug spray and Drench? The hydro guy sold me a bottle. I also have avid but he said not to use the avid

Im just curious... have you flushed your plants at all?

How often are you spraying?

If you don't have any bug problems, then cut back on the spraying, and allow them to recover.

Right before I switched to12/12 I noticed a couple webs so I sprayed advid 3 times 3 days apart. They looked good at the beginning of flower until week 5 on march 2nd they still looke great then I sprayed azamax just once just in case. That was going to be the last spray. I was told not to spay avid in flower. After that spray is when they went down hill. I flushed 7 days ago.

I did flush them when I switched to12/12 also.
The guy at the hydro shop told me avid is harsh stuff. Is that true? I got a bottle of promis. Has anybody used promis I like it because u can drench for root nats and fungus flys