Also, you might try feeding Rosy Red Minnows instead of goldfish. I've found they are usually better accepted than goldfish, and I've recently heard from a few people that goldfish contain a certain enzyme that is harmful to snakes on a long-term basis. Or you might consider skipping the fish idea altogether and try and get him on mice right away if he's big enough for pinks (try fish-scenting them). Whatever you choose to do, he's probably not going to be very interested in eating for a week or two.
I offered my Puget Sound Garter some worm-scented mice a few days after I got her, and while she seemed interested, I couldn't get her to actually take them. When I went to feed her the next week, she took a whole bunch of unscented FT pink mice immediately.

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- Natalie
(San Francisco Bay Area)
1.0 Banded California King
1.0 Mexican Black King
1.0 Goini Kingsnake
1.0 Bay of LA Rosy Boa
0.1 San Ignacio Rosy Boa
0.1 Ortiz Rosy Boa
2.2 Kenyan Sand Boas
0.1 Saharan Sand Boa
1.2 Rubber Boas
0.1 Pickering's Gartersnake