Ich normally will go completely un-noticed on healthy fish and you would never know if it was in your system or not. Tangs can be very aggressive and territorial and probably stressed your fish out which caused a huge decrease in their immune system. Removing the fish now in their immune compromised state to an unfamiliar tank to treat them may have the exact opposite of the desired result and kill them. As others have said I would just let them be and don't add any new fish to the DT for a few months so the fish can regain their strength and security.
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