Micro Decorator Crab
The Micro Decorator Crab is a tiny slow moving crab that loves to keep calcified algae clean of debris and hair algae. They are very peaceful, and very slow moving. Think about a tiny sloth that hangs out on calcified macroalgae all day eating any hair algae that grows on it. They will also hang out on rocks, but they prefer the additional camouflage macroalgae offers.
We will likely have to ship them attached to a small piece of algae that they are on in our tank so as not to disturb them, unless they crawl off prior to shipping.