yes, it will be the only macro and it will be in a critter carrier that acts as my makeshift fuge; my sump is only 16 gallons and I have a euroreef skimmer and a mag 7 return pump, so there isn't a lot of room down there. I have some minor algae problems in the main tank that I want to stay minor, so I want something that is going to be aggressive!
How did your friends algae escape into the main tank? Mine will have to get through a fine mesh filter pad (100 micron) and a pad over the intake of the return pump, so I think it's pretty well protected (on top of the fact it's in the critter carrier).