A reaction chamber, some GFO and carbon dosing. I know, not the answer you wanted. Although there are plenty of algae eating fish, they won't fix algae problems, only contribute. The presence of nuisance algae means you already have nutrient issues. Adding another defecating animal is not the answer. Work on getting you nutrients under control, lots of water changes with RODI water and nutrient export(protein skimmer, gfo, macroalgae, and carbon dosing).