I don't have an agressive tank so I hope you guys don't mind me jumping in. With that said I think a fuge would buy you something. The macro algae in it could out compete other forms of algae(that would be a good thing). It improves water quality(that would seem to be a good thing) you can also put one heater in there, and one in your sump, and voila' less cluttered display, also improves tank volume(better water stabilaztion), down side cost, I'm sure thera are more downsides, but I can't think of any right now.