No the spots are on the fish, I know it's not
ICH, it's the scales on the fish. I've had many angel fish over the years but never had a problem like this one. I heard about the angelfish disease but never experience it. I want to treat the tank which is 46gallons but not sure what to treat it with? I just did 15 gallon water change the other day and I always use Aqua plus for water treatment.
I just found one of clown loaches dead too.

I had this tank empty for over a year due to health reasons and just started it up a few months ago, now it looks like all the fish I've put in are dying, except for the neons which look fine as of now.