My latest Aquarium Fish Magazine (Nov. 2003), it has a long article about silver dollars, & a picture on the front cover. It says Silver Dollars are okay with flag cichlids, keyhole cichlids and jurupari, or any peaceful cichlid of like size. It also says they get along with plecos. And it says to avoid housing them with long-finned angelfish or Siamese fighting fish because trailing fins are too tempting. It's a very good article if you can find the magazine. It got me interested in wanting to try them in my next tank!