Yeah my urchin devours algea of all sorts. Cleaner shrimp are cool to watch and my snals do a fine job on my glass. I got rid of my emralds they became a pain as they got bigger, they steal and otherwise ill behaved. I have some dwarf blue leg hermits which are way less aggressive then the red legs I had. They even happily except the shells I leave lying around instead of attacking my poor defenseless snails.