Hammer Coral

[Mpolizzano]

I have a couple hammer corals that both slowly start to invert when the moonlights come on (around 8:00 PM). When I get up in the morning around (6:00 AM) moonlights still on they are fully open and extended. I have yet to see the tentacles. Is this normal behavior of hammer corals? Need some advice. Thanks.

 

[AquaRick]

Yes, hammers tend to retract at night and come out in the morning.

 

[bskerrichard27]

Mine do this all the time

 

[bskerrichard27]

Then look like this in the day top right of pic