How about no feeders? At least not fish feeders. Fish feeders carry the risk of introducing disease to your tank and your fish. Often it's a "when" and not an "if" situation. Live feeders also increase aggression. If you absolutely must feed your fish something live go for something that doesn't encourage an aggressive animal. You can go with feeder shrimp, but large adult worms are just as good. Sometimes you can cut up bits of shrimp, fillet, etc...and if your bichir isn't picky he might just go for it.