Is this healthy/okay?

[Hiimscott]

Hey, new to reefing and have been working during the day for the last few weeks and have only looked at my tank at night when the lights are ramping down. These two have always worried me because they shrink up at night. But I've had the day off today at home and the back one is open the to the fullest I've ever seen it.. is this normal? Do they both look healthy to you guys? Thanks!

 

[LiLinka]

They start to close up as your light ramps down. It shouldn’t be an issue.

 

[littlefoxx]

Hey, new to reefing and have been working during the day for the last few weeks and have only looked at my tank at night when the lights are ramping down. These two have always worried me because they shrink up at night. But I've had the day off today at home and the back one is open the to the fullest I've ever seen it.. is this normal? Do they both look healthy to you guys? Thanks!

Thought all my corals were dying when I first saw this. They all close or shrivel at night but start to come out when the lights come up