Just thought I'd point out that it's a good idea to see what could have caused the scale rot, and change whatever it is. For example, if the substrate is too damp try misting it less (if you spray it), or dry it out slighty. If you ball spends lots of time in a shed box, take it out from time to time or let the moss dry out slightly as well.
Could be as simply as not spot cleaning - very easy to do; you just start spot cleaning