frogspawn bubble?

One of the heads on my frogspawn has a big bubble right in the center, was told not to worry it's just splitting. It's been doing it for about a month now -should I be worried or do anything? Everything else about it looks fine. Curtis
 
I will, the bubble is taking on a different shape & seems to be getting smaller. Thanks for the response. Curt
 
Thanks for the post. I have also had these mystery bubbles appear on my frogspawn and hammer corals and didn't know what it was :oops: . I am very glad to find out that they are just spliting. Both of these corals have gotten hugh and I guess that must be the reason :D ....
 
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