I always worry about biomass when someone talks about overstocking a certain species. At 400 fatheads per lb; 40 lbs is 16,000 per acre. THey prefer shallow water and don't evenly distribute so you can have too many oxygen users and waste eliminators per given area. Also, fatheads don't get large enough to sustain mature fish. The protien isn't equal to the energy expended.

I love fatheads. I buy several pounds per year to feed small bluegills. They are very hardy but have their limitations as far as ongoing protien. That is why bluegills are the backbone of the fishery. Crappie only spawn once a year. Bluegills spawn multiple times. Mama Nature has continually corrected my "out of the box" thinking but I keep trying and keep getting corrected. Who knows? Your mix will probably work for several years.