Couple questions first:
What is the other fish?
Is there places for the cleaner wrasse to hide from the other fish?
What is the alkalinity of the hypo tank?
Are you sure the stores salinity was 1.028? How did you test it?
IME Cleaner wrasse do poorly in shipping. Especially if they come from the Philippines or Indonesia as they pack them with almost no water in a small bag. How long had the store had the fishes before you bought them?
It is almost impossible to determine the exact cause of mortality on a fish.
Cheers,
Tim
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