of the cichlids I would say that the jack dempsey is the least of your problems. The Jag is the most aggressive IMO and will get the biggest. I dunno much about pikes and I don't know what species that is, but all pikes have a reputation for aggression as well.
Thanks for all the help guys. Do you think they would all do ok in a tank together? It seems like everyone is fine in the tank now, just curious