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Hmmm, some pictures do look similar to what the OP is experiencing, except that it seems to mostly effect the head area. I can't quite tell from the pics but most of the discoloration seems to be towards the back end.Look up LLD (LATERAL LINE DISEASE) or LLE (LATERAL LINE EROSION) I did some research and pictures match what your fish has. Hope this helps.
That was the other question I forgot to ask....Do have any stinging LPS corals or (more likely) an anemone he could have gotten stung by? Almost looks like he got caught inside a carpet or ritteri.
I wonder if that's what happened with the Koran angel at my store. During that time there were 3 other fish with what I believe was velvet (my manager doesn't believe me, he thinks anything spotty is ich ). I only noticed some spots on the Angel for a day then they disappeared and it got all blotchy and pale, then died a couple days later. I've been tiring to figure out ever since then if the Angel had velvet and a bacterial infection, or if it was some odd expression of velvet.The strain(s) of velvet that won't show spots often causes pale blotches as it damages the gills, but this is more common in angels although I've seen it in a chevron tang and hippo.
They are becoming stressed, put your finger tips on the top of your water, do you feel electric vibration ? Your pump could be shocking them and stressing them out unless you added something new to the tank that was very sick.