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Well, it's hard to determine the proper course of action based on the symptoms you have described.
It's not unusual for a new fish to hide, or lose colour, just from the stress of being the new fish in the tank. It's not unexpected for him to remain stressed in a bucket, either.
You don't have a hospital tank you can move him to? This would aid greatly in determining what is wrong with him. Unforunately, not eating, loss of colour and hiding are indicative of a myriad of fish diseases.
It's not unusual for a new fish to hide, or lose colour, just from the stress of being the new fish in the tank. It's not unexpected for him to remain stressed in a bucket, either.
You don't have a hospital tank you can move him to? This would aid greatly in determining what is wrong with him. Unforunately, not eating, loss of colour and hiding are indicative of a myriad of fish diseases.