This is a BAP submission - You're bidding on 2 pair juvenile Fundulopanchax cinnamomeus (Cinnamon killi). I've treated these fish the same as I have Gardner's Killifish (Fundulopanchax gardneri) with yarn mops and had lots of success. These are non-annuals so will live for 3-4 years+.  The males are just starting to color up a little and are about 1" long. I doubt they are at breeding age yet.

I got the parents of these fish from @interstition. Supe location strain.