None of the spiney eels are known for eating snails so i would be 99% certain they would be safe, but there is always a 1% chance of the unusual happening.
my neighbor has a tyre track eel and it has eaten anything that can fit in its mouth. they once had a bright blue lobster that was way bigger than it but it still cleaned it out.
I feed my tyre track blackworms, gut-loaded ghost shrimp, guppy fry, and the very occasional mealworm. I am sure he also gets all the molly fry in the tank.