Hammer coral has a bubble

I cant seem to get a good picture, but our hammer has a large bubble. It looks like it has swelled up one tenticle the size of a nickle. Any ideas on what caused this? Is it bad? What shold we do?

 

I've never seen or heard of this. If you can post a picture, maybe we can get some answers to what is going on.

 

anything picking on him or any corals around that could sting him?

 

There are some fuzzy mushrooms next to it. (been next to it for more than 6 months) Then there is a short tenticle plate about six inches away, but it isn't down current or anything. Hmmm...I will try to get a pic in the morning.

 

i have 2 diffrent collines of frogspon and the have bolth done this, i reed a lot to try and find out what this is and found nothing. the owner of the lfs said he had never seen this in a tank but he said in the wild that is how the spread with eggs. but mine went away after about 3 weeeks and have not been back.

 

I'll bet you a dime to a dollar that it is growing a new head. Sometimes you can catch frogspawn doing this.

 

Cool! Good to know. I'll keep an eye on it. Karma to you all.

 

Hi all! my hammer coral is doing the same thing. It also seems to be more retracted in it's
skeleton the past five or six days. Ca is around 430 dKH is around 12 no nitrates good spec grav. etc Here are pix.

 

Thats exactly what mine did. It went away and the hammer is fine!

 

Euphyllias do that when they are about to split.