Its perfectly fine as a display algae for a reef. It will grow slowly and can uptake nutrients through its growth, as all algae will. However, it wont grow as fast as say Chaetomorpha or Caulerpa and it will consume some Ca and Alk along with the other nutrients. More than the others would.
I dont think it being attached it a big deal. My bunches break off pretty easily.
It also resists grazing fairly well.
>Sarah