I have had this frag for a couple months now and it has been a lesson for me in SPS corals alone. The issues I have currently overcome are high PO4, Alk stability and lack of flow for it. So now I have good polyp extension and the flesh is iridescent, making me think it is doing well. My issue is while I was learning it receded to the center and the ends of the plate have coralline algae growing on them. Do I let the coral take its space back over or do I remove the coralline from the skeleton? If so, how should I go about removal?