In fact, when I moved one of my golden apple snails to a tank with black apple snails, one of the black snails chewed off a strip of shell from the golden apple snail!
What are chitinous teeth? are they capable of chewing through oyster shell?
Here's a cut and paste from http://www.applesnail.net/:
"The mouth of the apple snail is a vertical slit opening, located between the labial tentacles and leading to the buccal cavity.
Food is located with the labial tentacles and when needed gathered from the water surface with foot.
The buccal cavity, a muscular cavity with a set of calcareous jaws, 2 radula knobs and the radula (rasp tongue), is situated behind the mouth opening.
The radula lies on top of the radula knobs (odontophores) and is covered with several rows (26 to 53), each consisting of 7 renewable chitinous teeth. When the radula knobs are moved from each other, the radula is bend and stretched, this spreading the teeth on it, which provides the grasp function.
After the food has pulled into the buccal cavity, the strong, calcareous jaws cut off the piece near the mouth opening."
I bought a 5# bag of crushed oyster shell yesterday for $2.99 usd. The 50# bag was only 9.99 usd, but I didn't need that much. So I'll drop a few pieces of oyster shell in the tank and see what happens. Has anyone already tried this?
BTW, oyster shell is already proven to be an effective substrate for the Cichlid tank.