I have seen the polyp ball out when they have new growth at the base. I see three smaller ones so the main head could be pinching off so the new growth has a chance. I would however move it down to the substrate with good but not strong flow. Just in case the tissue has to strong of flow and it is being sheared off. I would feed it detritus and stir a little up from your substrate. That will be more nutrient rich then most foods and it can dissolve through the tissue easier. Eating small food have less overhead for energy needs for processing then larger food items do. So you waste less and maintain feeding longer so you get more nutrition.