Bubble Coral Question

[Gibsonnnn]

I've had a bubble coral for about two-three weeks now, placed it towards the bottom of the tank. I notice it will bubble up close to full in the beginning of the day (lights come on at 9am). Right around 4pm it starts to deflate almost fully until the lights go out at 9pm. Once the lights go out, the feeder tentacles do come out. Does anyone else have this happen with their bubble?

All other LPS in the tank are doing fine, params are also fine.

Thanks!

 

[cloak]

Mine doesn't really do this, but I don't think it's anything to worry about. After 7 hours of light perhaps the coral has just had enough. It's time to go into feeding mode.

http://www.advancedaquarist.com/2010/4/corals