red cap becoming yellow...

And it doesn't seem to be a "natural" color. It's
a strange yellow.

Let me know if you find anything out. I have an eggfish that was transparent
when I bought him (billed as red lionhead,lol) then turned cream colored, and
now is cream with a strange yellow color on his head and tail. It's a bright
crayola yellow. He spends most of his time at the top of the water, and has
actually had "sunburn" from his back being out of the water under the lights.
He sort of floats, but upright. He will develop red places along his back
where it sticks out of the water, but a couple of days in the bucket, and he's
back to normal, with no scale loss...

Good luck,

Deanna