I have investigated both of them with the tank LED lights, which are quite bright and emit a clean white light. No trace of the typical "dusting", only the shining patches across the head. It seems to be relatively normal coloration for a veil, but it is still concerning. The fin clamping has been bugging me since day one. He does have a black band running down the edge of his tail, probably 2-3mm wide. This raises the question of fin rot (or not). It is not overly evident from the photo I posted, but it is definitely there.