Best Reef Scanvenger

I would avoid shrimp, they are too fast/good at stealing food from coral. I had to remove my peppermints because they were actually digging inside my duncans to get the food out causing the duncans to never open up.

A serpent star might be good, mine moves around a ton when it's feeding time though and you might have trouble with it trying to crawl over the coral you're trying to feed as it tries to track down the food.

I think nassarius are probably the best option that I'm aware of.