He states they can change color on basis of nutrition, but I don't think he meant from gold to white stripes or vice versa, but rather brighter or duller colors, and I do agree w/ that.
I've even read some say their clowns changed, or lost stripes, some becoming misbars later on.
This has never happened to me, just parroting others comments.
I had a GSM and WSM and they were spwaning regularly, but I never felt like taking on the challenge of breeding them.
They were a great combo/pair IMO.