bichir feed

I have an auto feeder and have been feeding a lot for the past week, but the feeder is not very reliable so i was wondering at the worst case how longcan the bichir go without food?

I have been feeding my Senegals variety of things but at the back of my head there is always a fear of not giving them the nutrients they need. I feed them frozen market shrimp and pellets but I realized that there is no specific pellet food for Bichirs. Is it ok to just feed them...