bad news,bad mix.i have a 100 gallon and i tried this mix of a kole and a yellow.seemed ok at first,one week later the kole was dead and i had an ichfest ragin in my tank.ended up losing about five fish,including some of my faves.they did alot of posturing,then it seemed to settle down.but alas,they were fighting like no tomorrow after the lights went out.just my opinion,as i have tried this exact mix in a tank a lil larger than yours.i would not do it.