Some sites pretend that some snails, like ceriths, are cyano eater. I've seens my snails on the cyano, but i don't think they eat it ( more toxic than McDonald )..they just run over and cyano get stucked on the shell and have a free ride to get elsewhere. But yes, you should definitly get some snails for your aquarium. Based on my experience with 4 types of snails :
1 - Turbo : if you rock is solid and don't have corals ( they like to bulldoze everything 'cause they're huge ), they are the best workers due to their size.
Oh yeah...also like to suicide in powerheads.
2 - Astreas : Superb workers, quite big, but don't crush fragile stuff. My favorites. Beware : they are morons..can easily fall on their back and if you don't help them, they'll eventually die.
3 - Nassarius : Great like guys. Always cleaning, speedy, very precise and like substrate/glass/rock. Clean everywhere. If they were bigger it would be my favorites.
4 - Bumble Bee. Cool colors, but they sleep much compare to others..in my case. I noticed they like the base of my corals.
