#faviacoral

This is my first and only Favia. It has been in the tank for over 6 months now and was one of my first corals. There was a time where it was not doing very well, but I finally found a spot in the tank that it seems to love. It’s bigger, brighter, and fluffier than it has ever been. But since I...

When I bought the favia it showed very healthy and still is healthy, but about three weeks back this little thing started to apper and it has gotten a little bigger. It also seems to be coming out of the favia's tissue. Any ideas on what it might be, if it's harmful to the coral or not?