I have a ponytail palm that's at least 30 yrs old. Recently moved and it was slightly beaten up in the move. ALL of the leaves turned brown and fell off and now I think it has root rot. The base is turning white near the soil and looks like it's "splitting" around the base. It is about 4 feet tall and gets bright light in a southeast window of the house. It's only a standing stick now, but if I scrape a little of the stem with my nail, it's green. I have read it needs to be soaked in anitbacterial/fungal solution. Is this true and can I save my favorite plant?