[leebca]

Very glad to hear how slowly you started off, but I'm unsure why now the rush? As I originally suspected, but withheld until I got further information. . .

1. The aquarium is overstocked with marine fishes.
2. The addition of fishes is too fast for the bio-load to adjust.
3. The water quality is sub-standard.
4. The fish are severely stressed.

The above will lead to a wide number of possibilities of infection. There are many different kinds of bacteria in the water waiting for their opportunity to infect a stressed fish. Although the problems begin as bacterial, they may lead to fungal (both the true fungal and the 'fake' fungal pathogens) and death. Those spots are most likely the reaction to the water quality which will quickly become infected areas.

I would back off. Read this as part of your 'research:' Fish Stocking Limit - for FO and FOWLR