Dwarfs are aggressive and do best in a tank by themselves, with "slow" tankmates like Otto's and Buble Bee Goby's. They start off alright, but as they get bigger, they become more aggressive.
You live in Ohio right? I got my dwarfs at PetSmart...if you have one in your area and they don't have them, maybe they can order them in for you. I've heard of other people finding them at PetSmart as well. I went to three different stores before I found mine. Finally found them over by cleveland, about an hour away from where I live (up near cedar point). Just thought I would throw that out there. Good Luck finding these guys.
Tiff