feed garlic maybe add selcon to food to boost immune system. Try not to stress fish. Check all water parameters. Make sure tang is eating well and if spots get worse after a week or so then maybe consider treating with copper med. in seprate tank or start treatment now with non copper med. Just be cautious about doseing whole tank. I have had no too good luck with this but this is some of the info I got.
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Tank # 1 36 gal corner unit. 250w metal halide 10,000k bulb with 2 65 w antic power compacts. canister filter, 1 400gph power head. coral life 65 protien skimmer
Tank #2 75 gal W/ 29 gal sump. 1 250 w metal halide 15,000k bulb with 2 65 w antic power compacts also a 30" t5 coral life with one 10,000k daylight and one antic. pump in sump is a 900 gph mag drive and a korilia 4. Coral life 125 protien skimmer.
Love thy wife then thy pets cause if you don't she will bleach your tank | 
