Do hammer corals close at night?

[SmokinReefer845]

just curious if this is normal mine closes when the lights turn off almost in sync with my zoanthids

 

[Uncle99]

Mine as well, some more than others.

 

[JGT]

Yep, totally normal. Hammers are going beddy-by.

 

[outhouse]

They shrink dramatically every night, and it takes a bit for them to full extend.