I love jewel cichlids. I don't know which one you have though Hemichromis Liffali is my favorite. I also enjoy the firemouths. I would dump the plecostomous, add some caves and rockwork to the bottom and make the jewels or firemouths a trio of 1 male and 2 females though you can't do this w/ both of them because you can't allow 2 fish to be breeding in a tank this size at the same time. It's just not big enough. BTW: make the secure rockwork in opposite back corners so the potential pair will most likely pick one of these sites.