I've kept a 55 gallon native tank with 5-6 bluegills, 3 green sunfish, couple crappies, 3-4 yellow perch, 2 largemouth bass, and 3 black bullheads. This was many years ago, and I don't remember the exact numbers. I had the tank for about two years. In the end, everyone grew so large I had to release the fish in the waters where I got them except for the yellow perch that perished. This is what I learned.
- Crappies, yellow perch and the largemouth bass did not compete well with bluegills and green sunfish. When the food was given, bluegills and green sunfish would eat the most.
- Yellow perch did not do well in captivity. If I remember correctly, they're the only fish that all perished. It also took them a while to eat flake and pellet food. All lived couple months and died.
- Green sunfish are extremely aggressive. They constantly harassed each other and everybody else except for the bullheads. They are not picky eaters. They were the smallest of the fishes in the tank.
- Black bullheads are extremely aggressive toward each other. They will fight and bite each other for food and space. They grow fast as well. In two years I've kept them, they went from an inch to well over a foot in two years. They readily take any food.
- Largemouth bass are very docile. They grow fast, perhaps a foot in one year I've kept them, but they will be harassed by other sunfish. They take flake and pellet food, but did not seem to like it.
I've kept a 55 gallon planted tank with several smaller bait fish: mosquito fish (Gambusia species), fathead minnow, top minnows (blackspotted), and common shiner. But this tank had several tropical fish as well. Keep in mind that many bait fish you buy come with diseases and fungus, so it's important to choose healthy specimen and quarantine once you get home.
- Mosquito fish are aggressive. They ate all of my guppy fry. They will readily eat any food.
- Fathead minnow did well.
- Top minnow did not do well. I think they were out-competed by mosquito fish for food and space.
- Common shiner lived for a while. I remember they did not readily eat flake food at first.
I hope this helps.