10 great little algae eater, looks like a tiny queen conch, reproduces in your tank, and unlikely to eat anything you don't want eaten. I am pretty sure they aren't actually in the Strombus genus, but that's the name they are know for in the hobby. I had a Harlequin tusk, and these were the only algea eater I could keep - they were eaten, but reproduce too. No free replacements if yours don't make it.