BLACK RHOMS WILL WIN MOST OF THE TIME IF THAT IS WHAT YOU ARE ASKING. I'VE HAD BOTH SNAKEHEADS AND BLACK RHOMS. 5 A OFF 7 TIMES THE BLACK RHOMS HAVE WON. THE ONLY REASON THE SNAKEHEAD WON IT WAS 2 INCHES LARGER THAN THE BLACK RHOM. THE OTHER TIME IT WAS A DRAW BECAUSE THEY BOTH STOOD IN EACH OTHERS SIDE OF THE AQUARIUM. SERIOUS THEY SHOULD BOTH BE KEEP APART AND WHAT EVER YOU DO NEVER KEEP THEM TOGETHER IF YOU VALUE YOUR FISH. BY THE WAY DON'T TAKE ME WRONG SNAKE HEADS ARE SOME BAD DUDE'S AND I DO KEEP PIKE FISH AS WELL.