So I got three male guppies today and put them in my 29 gallon tank with 1 golden wonder killifish, 2 ABFs, 1 BN pleco, 1 rainbow shark, and 6 corycats. The African Butterfly Fish weren't the problem. The killifish was, and proceeded to attack them whilst I was doing a water change and searching for a missing guppy. Pretty sure the killi killed it, then when it floated, the ABFs ate it. Meanwhile the remaining 2 guppies were being dragged across the tank by the killi. They are TATTERED. I immediately took them out, treated with Melafix, then acclimated them to my 20 gallon which is now a bit overstocked. I had done reading on the GW Killie and it said guppies shouldn't be a problem. Well that was shot. I hope the other 2 recover. :/ BTW the guppies are bigger then the killi and ABFs mouth. Rest in peace little cobra guppy.