Thank you!
I've looked around and asked a couple feed stores and this looks like a good compromise:
Home Fresh Grow & Show Pellets
Home Fresh Grow & Show is a complete, balanced 15% protein diet designed for growing replacement chickens (pullets). It is also ideal for growing, showing, or maintaining pet ducks, geese and other game birds. Available in 50-lb bags, pellet or crumble.
Guaranteed analysis
Crude Protein, min ............................................................... 15.0%
Lysine, min ............................................................................ 0.7%
Methionine, min ...................................................................... 0.3%
Crude Fat, min ....................................................................... 3.0%
Crude Fiber, max .................................................................... 5.0%
Calcium (Ca), min ................................................................... 0.7%
Calcium (Ca), max .................................................................. 1.2%
Phosphorus (P), min ................................................................ 0.7%
salt (naCl), min ...................................................................... 0.25%
salt (naCl), max ..................................................................... 0.75%
Vitamin a, min ................................................................. 4,275 IU/lb
Vitamin e, min ...................................................................... 21 IU/lb
Now to figure out how to build them a pool without breaking the bank