If you're gonna keep minnows for an extended period of time, say a week (that is if they make it) do you have to feed them and if so what? Also do you have to change the water or just add fresh? I have them in a 10gal industrial water cooler now with an aerator.

I would feed them a little bit of tropical fish food every other day or so. Changing a couple gallons of the water wouldnt hurt.

i have kept shiners and ghost minnows alive and well for weeks in the fish tank with my illeagally kept baby bass, blue cat, and bluegill. Like the guy before me said, feed em' fish food. You might lose a few if you have other types of fish in there, but for the most part they will do fine. Just remember, Shiners are carp, carp are goldfish, goldfish emit larger amounts of ammonia in their waste, and will raise the pH of the water they are in and that will generall kill everything else if you dont control it. Carp type fish can live in a wider range of pH than can most other fish, so keeping it lower wont hurt them.