hammer coral growing a clear bubble????

turfgrass

Non-member
In the center of a head there is a huge clear bubble about the size of a quarter. has anyone ever noticed this? Thanks.
 
My hammer "grew" the same bubble about 2 months ago. It lasted for about a week and then it was gone one morning. I've had this hammer over a year and that is the only time it has done that. It's a branching hammer and is huge.
 
As soon as I started the thread the hammer started to close up some. I think it knows where talking about it.
 
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