What are some cool little inverts?

[Beanz]

Hey all, so i have finally decided that I'm gonna have my 15 gallon tank be an invert tank. The only thing is that its a pretty small tank and I haven't really dealt with any other inverts other than the shrimp i have and hermits. So I am looking for some suggestions for some cool inverts that are compatible and will be ok in this size of tank. I have a cleaner shrimp and some snails in there right now but if the cleaner will be an issue with other inverts I would move him. O and the last thing is I would be looking for inverts that wouldn't disturb/irritate corals cause its gonna mixed reef.