I just started using gh 3 part flora series nutes on my hydro plants and they did the same thing your plants are doing. It is nute burn, back off on the nutes and only go 1/4 to 1/2 strength untill they get used to the strong nutes...some people say they never have the problem but since I started using these nutes I have found many people with the same problem. I was going by the direction on the feeding schedule offered by GH...Seems to me they need to do more research on nutes with MJ...lmao