AquaMax Fish Food - 400 as 5D04 is 3/32" as 45% protein. AM 500 as 5D05 is 1/16" as 50% protein. These two feeds will be more expensive than AM 600 as 5D06 with 41% protein.
For feeding minnow/shiners I found it best for my usage is to just use what I am usually feeding the other fish and just somehow grind it. It does not take a lot of ground pellets to every day or two to feed minnows. Minnows will not get much to eat in a mixed fish sizes fishery while waiting for larger pellets to soak and soften so they can pick apart large soft pellets. IMO best way to feed minnows/shiners is find a way to grind your regular fish food. I have even looked into using a coffee bean grinder for the large pellets, but never tried it. Don't let your wife catch you using her coffee bean grinder to grind your fish good.