The blue light pics and video are a little difficult to see clearly. White light and closeups would help.
What I think I see are large white markings which looks more like injury or lymphocystis. Better pictures and a description of what you are seeing will help us provide a better diagnosis and recommended treatment. Injury could have occurred during the netting, transportation, acclimation of the fish, and other tank residents may have bullied him.
Saltwater ich appears as very small white spots, almost like sugar or salt. The more spots, the more advanced the parasite infection is. I see you have already placed the fish in your display tank. If any treatment is needed, you will need a quarantine tank.
In either case, you should contact the store where you purchased the fish if you just got him today.
