It will only remove nutrients if you remove the algae. Chaeto and other macros are much easier to remove, so people generally favor them. I had a massive hair algae bloom in the refugium of a new tank and I completely wiped it out by adding a couple of turbo snails. I moved the snails to the display and now only Chaeto grows in the refugium. It's pretty normal if this is a new tank, or you recently started feeding a lot more.