I bought a feeder last week. I sent Purina a email on where I might be able to find AM..
Never heard back from them.
Now I'm thinking, maybe I should have worked out the food side of the equation before I bought the feeder.
Of course I don't have any fish yet, so it's a bit theoretical. (But they are coming.. )

12 yr old pond, 1 ac, 15' deep.
RES, YP, GS, FHM (no longer), HBG (decreasing), SMB, and HSB (only two have been seen in 5 yrs)
I think that's about all I should put in my little pond.
Otter attack in 2023.