help

all i have for a clean up crew is 6 nassarius snails and 2 peppermint shirmp (i think one is dead as i havn't seen him in weeks)



But i wanted to get a good algae eating (not turbos)



So, after adding my wrasse which is this week thursday, can anyone tell me if i should get a sea urchin or just some snails, only problem with snails i only want the ones that can turn them selves over if they fall from a rock/glass. So any advice on this would be awesome, and also i will be adding whatever algae eater with a cleaner shrimp (maybe) next week



Thanks