You're limiting yourself with fathead minnows and even with cover and spawning habitat I doubt they'll be around very long. The problem is they are so slow moving and are easily wiped out by bass. On top of that they don't provide large enough forage for larger bass as the fatheads top out at a very small size. For a balanced bass population of all sizes you need progressively larger forage.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.