Why is my bubble coral not opening ?

[sck90]

Hello,

I have a bubble coral since about a year and it has been healthy and beautiful until maybe 2 months ago, when it stopped to fully extend for a reason I cant identify. AFAIK, nothing has really changed in my tank parameters or maintenance. All my other corals, including severals lps and some sps, are thriving. I included a picture of the bubble coral, which is very closed today, and a fts.

Parameters :
Alk = 9.5
Ca = 450
Mg = 1425
NO3 = 8-10
PO4 = 0.10-0.15
Sg = 1.026

The only thing that changed a little bit over last months is NO3, which used to be more at 15-20 than 8-10.

Lights are 2× radion xr15 blue g5 at 60%, but they used to be at 70-75% (I thought maybe the bubble was getting too much light). It is getting approx 100-120 PAR. The bubble is getting very gentle flow.

Any idea what is going on ? I really like this coral, I would be very sad to lose it.

Thank you in advance for your help.

 

[reneeL]

My Bubble Coral
Mine does not do well with a lot of current. I had to deflect the current. Hope you can save it.

 

[sck90]

My Bubble Coral
Mine does not do well with a lot of current. I had to deflect the current. Hope you can save it.

It really isnt getting any strong flow. Only very indirect water movement...

 

[Mr. Mojo Rising]

When something weird happens in my tanks, I automatically do a large water change. I suggest that if you haven’t done it yet. Otherwise I have no idea but wish you good luck.

 

[FUNGI]

The Betta rubbing against it when it goes into that cave?

 

[Hairyteeth]

The Betta rubbing against it when it goes into that cave?

Good idea right there, mine hates being touched….gets symmetrically smaller bubbles when ticked

 

[exnisstech]

The Betta rubbing against it when it goes into that cave?

Exactly what I was wondering .

EDIT: This is mine. Its getting similar par and medium flow from 4 MP40s but it's center of the tank so flow it not direct. Mine likes enough flow to make it kind of wiggle like jello if that makes sense.

 

[New Hampshire Reefin]

Did you add any GFO recently? I notice that my LPS get irritated if I don’t rinse my GFO out enough before putting in my tank. It irritates their skin but it doesn’t really impact anything less in my tank.

 

[sck90]

Thank you all for your great inputs. I didnt think about fish possibly irritating it and that really makes sense. My tomini tang also likes to pass around this cave. Ill try to move the bubble coral.