Looks to me like you have a Brown snake or Dekay's snake Storeria dekayi. If so, he most likely will not eat minnows or pinkies, at least mine never did. I never kept these guys long term because I found it difficult to provide the proper food for them. They like earthworms and slugs and I have noticed that the one I have now will eat the rolly polly bugs on occasion. Setup can be like a garter but they seem to be even more secretive. They will eat readily in captivity if you can find the proper food. Leaf worms are not appropriate (see other threads regarding worms on this site) and earthworms can be difficult to find in winter. At least here in Wisconsin. We've had a few unseasonably warm days now so this afternoon I am going out log turning to see what I can find. If I can get enough to fatten it up I will probably cool it this winter with the rest of my breeders.

Good luck with it.

Steve