This wrasse seems to sleep in the rockwork most of the time...he basically disappears though. We've seen him on the sandbed a couple times, but we've never seen him dig or bury himself. I believe our substrate is Carib Sea Aragonite.
I'm thinking either some hidden, unknown predator or a disease is the culprit here. I don't think any of our known fish or inverts is attacking him.
I'm wondering if it would be better to leave the wrasse in the tank, continue to treat with garlic, and see if we can figure it out. Or, if we should move him to another tank or set up a QT so he doesn't keep getting attacked. He is extremely difficult to catch and gets pretty stressed so I don't want to move him unless it's necessary.