Posted 03 January 2010 - 11:59 AM
Hello and welcome from one Nathan to another!
A few things to consider:
1) Fatheads and sunfish are very aggressive feeders, and darters are not. It will be difficult to keep darters happy in that tank- not impossible, but it will require extra effort. For example, you could drop flakes or pellets at one end of the tank, and while the minnows and sunnies are distracted, use a length of pipe to deliver bloodworms to the bottom at the other end of the tank for the darters. If that sounds like a lot of trouble, consider setting up a second tank for your darters.
2) Most sunfish will prey on minnows and darters. Perhaps your best bet is the orange-spotted sunfish, a small and peaceable species found in your area. Fortunately, o-spots are also among the prettiest sunfish!
3) Fatheads are cavity nesters. If you want your minnows to reproduce, you will need some cave-like structures. Ceramic flowerpots, pieces of pipe, or stacks of rocks or bricks will work. If you go for the last option, be careful to stabilize the stacks so they don't get knocked over and possibly crush your fish or even crack your tank.