Whats your salinity at?
I find that a lower salinity 1.023 is better when first quarantining tangs and before moving to display I gradually increase over a few weeks to 1.026 (display).
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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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