There's no such thing as wild german blue rams -- that's like finding a wild pomeranian. The wild ram is a different colour morph. But, that's probably a good thing: wild rams are pretty delicate.
Keeping them will really depend on your goals. Mikrogeophagus ramirezi is the more sensitive of the genus, but especially good quality captive raised fish, they're generally pretty hardy. If you want to breed them, you'll have to provide soft, acidic water, or the eggs are unlikely to hatch. If you're just interested in keeping them, anything should be fine, provided its not a big shock from where they came from, and you keep the temperature up.
If they came from Frank, which it sounds like they did, they're in Southern MD water. That's fairly soft and acidic. I don't know where you are, but lately that water has spread progressively north thanks to all the rain we get nowadays. Here in Silver Spring, the water is soft and neutralish, but goes acid in the aquarium.