If you mean the Convict “goby” I kept one for 2 years before killing it accidentally. Always been a favourite fish, very close second to the flashing tilefish.
As juveniles they swim at the top but as they grow and age they begin to sit at the bottom and create burrows to go through.
They’re relatively easy to acclimate to captivity, it’s just having stable and secure rocks that’s the issue IME.
I wish I had a photo of my old one but unfortunately I don’t.