What causes PD and NG to close like a clover?

[Hypertek99]

Starfish???

 

[Paintguru]

What's that black and blue thing on the top right of the picture you posted?

Banggai Cardinal

 

[ryno212]

has anything changed on this subject? Mine do the same thing, so I tried to look up some threads on here and this is what I was looking for...did anything help to make them open?

 

[reef-nut]

I have the same problem, but with some palys that are not so colorfull. They look just like the picture of your PD. Actually my playthoa grandis are doing it to. Whats going on? Can the weather getting warmer cause this, even though you have heaters and chillers? I have noticed in the past years that when it gets warmer no mater what I do my corals do not look as good as they do in the winter.