Help... Newby with bubble coral issue

[MA4446]

Hi, I'm still a newby. Under a year exp, and I saw my bubble coral doing this during the night.

Normal? Sick? What do I do?

 

[cloak]

It's probably just expelling waste. (pooping) They'll do this from time to time. As long as your parameters are within reason I wouldn't worry about it too much.

 

[ColaAddict]

It's just closed up. they do that all the time. all corals have their own version of closing up. don't sweat it.