candycane coral

I saw these dark “bubbles” show up. I tried blowing them off with a turkey baster and they wouldn’t budge. Tried nudging them and they’re somewhat firm (didn’t pop). Tank is 4 months old; have been working to get dinos under control. Is this related? Any idea?? Pic attached!

Hey again Reef2Reef! Today I noticed something I’ve never seen before on my candycane coral. It appeared to have a grey crack on one of the heads. It looks weird in comparison to the rest of the coral. I don’t know if it’s starting to bleach or if it’s just a sign of growing like stretch marks...