HELP!!! Bubble Coral not opening....

[nc2tarheels]

I have a 12g Nano DLX and I have a small bubble coral. Well the past 3-4 days it hasn't opened at all. I've had this thing for about 3-4 monthes with no problems at all. I tested everything and all is well.

ph-8.4
trates-0
trites-0
ammonia-0
calcium-good
salinity 1.23-1.24
temp-83

 

[Hoggn]

Mine sometimes acts like that. If it doesn't open in another day or 2 then I would be worried!

 

[JLBubbles]

I have a green bubble coral that looked great when I first put it in my 24gal nano cube but then for a week its bubbles were deflated and open at all. That lasted for about a week, and just recently after feeding it, it started to open up again. Sometimes water changes or lighting may affact it. what kind of lighting do u have and how long are u leaving your lights on for?