Lost kuhli lost color

A long lost kuhli appeared today after gravel vac and wc. He was almost albino, lost a lot of color. Is this normal for one that has perhaps been hiding and burrowing for a long time? Do I have a problem? He went back to wherever and no pic sadly. 6 or 7 other kuhlis with normal coloring no weird behaviors.
Whenever I got mine flushed out from where they were they were lighter colored for sure. I had a fake log and they found a way in there. I wouldn't see them for weeks. I didn't get any more after them ones. I want fish I can see.....lol
if you keep them in large groups you see them a lot
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