What was never mentioned is tank size? If the tank is only 50 gallons ish..... then the stress of a small tank will continue to bring on disease..... may not be ich at all. Tangs need space or they will not ever be healthy and happy.
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Red Sea Reefer 525 XL, Vortec M1, Reef Octopus 150 SSS Elite, Apex, WAV power heads, 3 X Aqua Illumination 26 HD. 
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