I'm going to set up a 75 gallon tank in the somewhat near future. I will most likely put a featherfin synodontis catfish in there, but I wondered what everyone else thought was the best tankmate for it. I was leaning towards getting an oscar, or a jack dempsey. I would like a kind of large cichlid with a neat personality that would both fit into the setup and get along with the catfish. A penny for your thoughts? Or perhaps a friendly thank you? 
