I've treated tangs with Cupramine but I don't know if I'd treat an Achilles or other sensitive specimens.
If you use Cupramine, buy the Seachem test kit and measure the tank in liters - one drop per liter is the proper dose.
You must use RO or distilled water for top-off or new replacement water. Highly recommend that you keep the water at 35ppt and keep an eye on the DKH. It also wouldn't hurt to buy an "ammonia alert" badge from Seachem.
good luck
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