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yup looks like ich, like morty said, remove all fish to a hospital tank and start treatment. Leave DT fishless for 72 days.
Hard to say what could have caused it as ich can sit dormant in fish until their immune system weakens and allows it to start to spread. Your other fish aren't showing signs now probably because their immune system is slightly stronger but it is only a matter of time.
The tang and wrasse don't look too bad right now so you caught it early, start treatment quickly and you shouldn't have any losses.
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