Ok, so I have a 75 with a 9" male JD a 10" sun cat,a 10" brown bullhead, and a 9" delhezi bichir. I would like some activity from like some type of schooling fish just the problem is these guys like to eat, and they all have big mouths and even bigger stomachs. is there anything i can add to the tank to make it a little more active that wont get eaten right away?