At least yours is still yellow!Mine has changed to a drab brownish color and has stayed that way for months.He too does not have a burrow.He lives under a couple of small pieces of rock and seems to just levitate over his rock all day waiting to be fed.I have been trying to find a pistol shrimp to keep him company.He used to push the other fish away from his territory,but they payed him no mind.He will open his mouth wide to look ferocious to scar them away.I kinda feel sorry for him when it does'nt work.