I used to have a snail problem, and i just solved it by crushing every snail in sight against the aquarium glass. My keyhole cichlids ate them once crushed, well, chewed on it and then spit some stuff back out.
And now my tank is snail free for some months.....so i put in a new snail from a friends tank
I just wanted a little more action in the tank.....and that from a snail......so far its been in for 2 weeks and ive seen no baby snails yet, although i am pretty sure my keyholes will eat them.
And on a side note...........i'm too anxious to have my keyholes mature till they mate, so in the meantime, i'm going to build my own tank.........my only worry is the lights......no idea how i do that without building a hood.
Sorry i got of the subject, but you could actually try squshing them, and maybe your fish will eat them. saves some money on food.