Many years ago I converted a cabinet to a snake home & used aluminum C channel for sliding glass doors. I found some narrow self-adhesive velvet-like strips that fit in the channel & allowed the glass panes to slide easily. I can't recall where I bought it though- might have been a craft & fabric store- & even if you can't find self-adhesive strips, you might find the right stuff you can glue in place. I wouldn't use any sort of lubricant, because it could transfer & sicken your animals- besides, lubricants are messy & need reapplication.