I am setting up a 48" 80 gallon mostly SPS tank, and I'm wondering what everyone thinks is the most beneficial fish to add to the tank and why. By beneficial, I mean that the fish eats nuisance algae and or pests. Coming from a 300 gallon SPS with an almost unlimited selection of fish, the 80 gallon SPS is a lot more limited to what I can put in there and keep happy. The 300 met size requirements for most reef fish that are readily available in the hobby, the 80 does not. So what are everyone's favorite beneficial fish that will thrive in a 48" 80 gallon mostly SPS mixed reef?