That is a M. doreensis, or LTA. They require a rather deep sand bed to do well. This tank has a minimal layer of sand, which result in the anemone not in it's normal element. It also look like the tank has rather high nutrient, from the rather dense surface algae on the rock.
What I see here is a stressed anemone with injury to the foot. There is compromised and punctured dermal layer. Healthy anemone may self repair and heal, just like any other wound. Stressed and or sick anemone may succumb to this injury.
To help this anemone, I would remove him from this tank and treat him with antibiotic. Once the wound is healed, get him to an environment suitable for him. Clean, stable water, high light , low current and a deep sand bed of at least 3 inches.