Sorry it's taken so long for an update but I wanted to give the ladies enough time to recover fully before I shared my results. Results couldn't be better!!!

My ladies are doing better than ever. Ever since I started using Cal-Mag and a few pellets of nitrogene in each watering, the results haven't been better. They all were fully recovered within a week and the growth on the leaves stopped almost instantly. I would still like to know what exactly happened to make my ladies do that and why it affected all of them??? I am assuming it had something to do with lack of nutes in my soil but oh well, problem is solved and now I know how to fix it if it happens again.

Thanks for the advice!!!