Added healthy Christmas Wrasse to my 125 fish only tank 8 days ago and have never seen him. I'm fairly certain he did not jump or perish. I know they bury in sand bed but for this long? I've diligently watched tank especially during feedings and when lights go out and no sightings. I have noticed one of my ornamental boats tipped over each morning and suspect perhaps the wrasse is under it. Should I give up hope yet?