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I had a one leopard wrasse that would bury himself for weeks at a time,but he was well established in the tank and a voracious eater.I have also had newly acquired leopards that buried themselves and never surfaced again.You could check for ammonia and nitites-an indication that something died.If you have a clean up crew in the QT tank,they may have disposed of the body in a matter of hours.It's really a personal call at this point.I would wait another week or so if you can,but if you must know if he is still in there,be very carefull in removing the sand to find him.Newly acquired leopards tend to be weak and disoriented from transport and handling,so if he does surface,getting him to eat will be another challenge.
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