not sure how strong the current is on those.
i wouldn't put them where they can get face to face...stresses them out and they'll die. i have to put a candle in between my two so they don't see each other all the time.
they can eat bloodworms...frozen/live. that's a good treat if yours will eat pellet food. i have not had good success w/ that.
you can order them online, but will cost you an arm and leg. or you can keep an eye out for them at a lfs. you'll have a better chance of finding them at a smaller store rather than chain.