Kenaqua

I currently have a 3in Spotted Congo Puffer that isn't willing to eat any bloodworms. It will definitely go after any snails I put in the tank which is good but my Ramshorn population isn't able to keep up. I think possibly part of the problem is the store I purchased from was feeding using minnows which I don't. Anyone have any ideas on how to get my puffer to readily accept bloodworms? Thanks!