Snakeheads or Gars can't be properly house with Bichirs IMO, most of the cases where Gars/Snakeheads share the tank with a Bichir, most polypterus will suffer bullying, bite marks, nips, worst some may end up headless...
There a lot of selection for Snakeheads tho, but most of them are pigs, you may have only have a shot feeding polys in the night when the lights are off, and that's the case, when you do feed at night Snakeheads tends to be skittish which might lead to it's jumping and really, it's a pain to get a wiggly snakeheads inside a tank again.
