Hello! My acan has been thriving! I got it as a single head and it has already grown 2 smaller heads in the matter of 3-4 weeks! Anyways, I noticed a weird something near the mouth of my acan that appears to grow through it. I cannot figure out what it is. I’ve tried everything to try and get it off, but nothing makes it blow away. I’m thinking it has fused into the acan. The coral itself looks fine, other than the part where the black thing is growing. The coral is mad in the photo because of my water change. Any help would be appreciated