The best replacement for minnow is tadpole.

The best alternatives to minnow are rated as following:
★★★★★  tadpole
★★★★★  guppy
★★★★  shiner
★★★★  mighty bite
★★★★  shad
  new jumping minnow
  worm

Your alternative for minnow is not listed? Suggest!
Speaking about minnow, one probably shouldn't forget about spinner.

Other search terms related to minnow and their ratings are:
★★★★★ spinner
★ jig
You have in mind a companion for minnow and it is not yet here? Propose!



Google Trends

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minnow
tadpole
guppy