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It does not look like velvet (Amyloodinium ocellatum) to me at all. Velvet usually begins around the fish's gills and spreads outward from there, and I don't see that in the OP's photos. Velvet also creates much smaller spots which are more densely and more uniformly dispersed. Fish with velvet usually decline very quickly. It does look like Ich (Cryptocaryon irritans) to me. Many fish, particularly surgeonfish, seem to do just fine with occasional light infections of Ich. But either way, the most recommended and most reliable treatments are largely the same. Remove the fish to a separate treatment tank and treat with copper.
Copper-based treatments are readily available from every LFS and many big box stores which carry pet supplies. No need to wait a week for a mail-order medication. I've seen no real evidence anywhere that any other treatment is more effective than copper-based medications.
But yes, the fish definitely needs to be caught and moved to a separate tank for treatment. That is the immediate goal. If you can't catch him with a net, figure out a way to trap him.
Really, all of the fish need to be removed and treated at the same time and the display tank left without fish for some period of time, depending upon the life cycle of the parasite. As I recall, 8 weeks is the generally recommended minimum fallow period.
How big is the display tank and how many fish are currently in it?
And what the heck is 'TTM'?
Exactly why I didn’t think it was velvet at the very beginning. Thank you.
I strongly recommend treating the entire display tank as going fishless is hit or miss. I have heard to many cases where people say they waited for 10 weeks or even longer and fish showed signs or ich after being treated and put back to the tank and white spots developed again.