i bet the cramped quarters will have had bad waterquality as well.
Your fish may need some time to aclimbatize to good water quality.
Plus in the wild Oscars get cut off from open water in the dry season.
They will survive in pools for a very long time.
Your fish looks healthy and will come around.
What did they feed him in the LFS?
You could try dipping pellets in garlic juice, that may work if he's used to pellets.
Or try mealworms, that works for any oscar i've had.
Good luck, and don't worry yet!
Your fish may need some time to aclimbatize to good water quality.
Plus in the wild Oscars get cut off from open water in the dry season.
They will survive in pools for a very long time.
Your fish looks healthy and will come around.
What did they feed him in the LFS?
You could try dipping pellets in garlic juice, that may work if he's used to pellets.
Or try mealworms, that works for any oscar i've had.
Good luck, and don't worry yet!