MYSTERY BUBBLE ON DUNCAN CORAL

[spetrillo]

Does anyone know what this bubble is forming on my Duncan? Possible OG bounce mushroom growing on. Slowly rising perimeters, had a small dip after water change.
PH: 8.2
 Salinity: 1.022
KH: 9.9
Mag: 1140
No3: 20
No2: 0

 

[blaxsun]

Are you missing a mushroom?

 

[KrisReef]

Might be growing new heads from the base? Not typical growth but kind of looks that way?

 

[Steve and his Animals]

Salinity is on the low side. Try 1.024 to 1.026.

 

[snorklr]

well if you start to see tentacle-like bumps around the perimeter it will be another head...the center depression probably the mouth...got a single head one in september ...it immediately sprouted 2 more which are now full grown and a third thats about a 1/2 inch