What ShmooBeast said, My GSP will destroy a eyeball sized snail or tad bigger inside 8 seconds, and no more snail.
You may try them baby shrimps frozn kind fromt he store,, nightcrawler pieces "about the length of his body or just small ones like baby worms is ok to "cuts down on waste in tank" clam muscles, and I can't think what else like that.
I have wild snails 'ramhorns' that breed my puffers snails