I've been building up this tank for quite some time. I finally got it put together this past couple days. Mostly anyway. 55 gallon and all stock is native to Congo /DRC region in Africa, not Cichlids. Now I'm looking for opinions and ideas on final stock addition. Currently has 2 Ctenopoma Acutirostre (leopard ctenopoma), four Synodontis Eupterus (feather fin catfish), and a single Gnathonemus Petersii (elephant nose). I have for several months been mulling over options and for the sake of receiving opinions and additional ideas I'll stick with common names here on what I've researched : Congo Tetra, Congo Barb (both Clypeobarbus Congicus & Barbus Callipterus), African Butterfly Fish. I also recently found that there's a number of Killifish native to the area as well. Here's where I'm at and why I'm looking for more information and ideas or opinions. Butterflies are unlikely to fare well with my setup with current at the surface. I absolutely can make some changes to that to make it suitable for them but I run into issues stocking them with anything other than my current stock for various reasons. Congo Tetra are beautiful, but I've just never been a tetra fan, and honestly I'd like to get some color in the tank. Plus they may well out compete my elephant NOSE (EN) for food which is unacceptable. Both barbs I cannot enough find info in swim levels or aggressive tendencies and eventually they may become lunch for the Ctenopomas. They are kind of borderline on the snack size. They both seem to be less aggressive for feeding but barbs will be barbs and I still have concerns about feeding competition with my EN. Killis, I know they are short lived and breed profusely as well as seemingly difficult to come by. I cannot seem to find a decent way to search for more info on African varieties as everything just brings up the turquoise African killi and aging research. But I have found some Killis would be larger than snack size and many would give me color. Again though with not knowing swim levels. Color isn't required but would be nice to find a nice red to go with the tank. Swim level and size are my focus. Mid to top swimmers required, and has to get at least two inches to hit that borderline snack size if they are narrow fish like the barbs. Doesn't have to be a schooling fish but preferably one that can live in groups as one more fish isn't quite what I want. And must be available in the Congo /DRC region in Africa. Not specific to a river or lake necessarily though my stock so far can all be found around the Congo Basin area so would be great to stay at least that concentrated though not mandatory. I'm not looking to add any cichlids mostly as I am looking for social behaviors at the mid to top levels of the tank. Those levels are completely devoid of activity currently. So toss it out there. Ideas, options and questions if you have any!!