So later with a proper repot, I heard I should expect old roots to die and new ones to establish. Should I go back in and cut off old roots or just let them stay? I'd assume this would be months after a repot.
I've successfully pulled out a potfull of all old moss with a pair of tweezers, then tucked new medium down around the good roots with a chop stick. Held the plant until I was ready to repot at the right time.