HI, Introduced this lipstick tang into tank about 4 months ago. Was a small fish and our hippo tang took a dislike to him straight away. Within the first few days he stabbed (cut) him with his spike. Well after a few days the feuding was over. But the cut has now developed into a cyst type of wound. (looks like a whitehead pimple that needs squeezing) Does anyone know if this will disappear or may become a problem ? He eats,swims and play normally ? I just thought after 4 months it may have gotten better ?