Glad to report that Goldie is completely back to normal. I've been putting Melafin at 1/5 of the dose in his water daily. His body has returned to it's normal color and the missing scales look filled in - it's that quick that they replace 2 scales ?
His tail continues to have that straight line across but it hasn't broken off anymore. He had a jagged fin appearance when I got him, so the rest remains the same.
He runs all over the tank, not quite as frantically - so he's probably happier in his warmer tank. Thanks to all for their advice that helped this little guy.