I took a little time and did some research for the fish I wanted to put in my 20 long, and who would eat my con fry as feeders. I was looking for a fish that would reach about the size of a con, more or less. I narrowed it down to a Jewel or a firemouth. I went to the LFS today and bought a gravel vacuum and a firemouth. He's not small, probably medium. I would get a picture, but since I placed him in the aquarium, he's basically been hiding and remaining on the bottom.