As big as you can get um. When I used to use live I would go as big as a 16" sucker and as stupid as it sounds some times the little hammer handles would come in but they didn't stay too long before they would figure out it was best not to take the bite
![Grin ;D](https://www.iceshanty.com/ice_fishing/Smileys/default/grin.gif)
But most of the times it keeps the small ones away