My Oncidium roots are molding, leaves turning yellow

[WaterWorksGS]

Hello all! I am new here and I hope I'm in the right spot. I feel in love with my oncidium orchids that I ordered to sell at my store and kept them all. When I received them over a month ago they need to be re-potted really badly. I re-potted them with hydroton in a 4in net pot. I am using Dyna Bloom 1/4tsp/gal and the Dyna Protekt 1/4tsp/gal together. I water them only when they get dry(1/wk at most).
They are in full bloom now and just the other day I moved out of my indoor greenhouse and I noticed mold on most of the roots and hydroton. I have read that Physan 20 should be used to disinfect everything. I ordered that today however it will not be here until next week A couple of my ladies have leaves that are turning yellow also. I had 3 that still had a couple of buds left to bloom but they fell off. I had them under a 150w HPS for 6hrs a day. That is why I moved them-hoping that they were getting too much light and the new buds dried up. I really do not want to wait until next week for Physan to get here to do something. Any ideas on what I can do now to get rid of the mold and not stress them out to much? Thank you!