Plecos discoloured patches

I’ve had my pleco around 4 weeks now and I’ve recently noticed there’s a patch on him that’s slightly discoloured from the rest of him. He’s still feeding and acting the same. So doesn’t seem unwell. I have him in a 200L tank. Ph is 6. Zero trace of ammonia and no trace of nitrate.

It's just camouflage, nothing abnormal.