Melanarus. Wrasse

Milky3

New member
Just purchased this wrasse and it disappeared in the sand bed and has been there for 24 hours. When should I worry about him?
 
The longest amount of time that a new wrasse has hid and/or played dead in my tanks, and lived, was about a week. The melanurus wrasse in my current tank hid for at least 3 days, but it was intimidated by a powder blue tang. Are there other fish in the tank?
 
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