What's wrong with this toadstool?

[tamara]

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Just saw this hole on my green toadstool. What would cause this? What should I do to keep it from getting worse or cure it? Thank you for any help you can offer.

 

[Boogie]

I don't know if its always this way but mind did the same thing, thought it was dying as the hole turned into a tear and the whole toadstool looked pretty bad. Started to notice the section that I thought was dying off started folding together forming a foot. Took about a month but mine split, leaving me a little stool down on the sand after it dropped off. Now have two, one big, one baby.

 

[Zooid]

Yep, looks like it's just going to drop a lobe off. My toadstools do this when they get large.

 

[mhaith]

Mine do too BUT keep an eye on it. I have dug out a well camouflaged nudibranch out of some softies before also.

 

[tamara]

Thank you for the quick replies. Since this is one of Zooids toadstool babies, the first thing I put in my tank over a year ago, I'm happy to hear from Zooid and Boogie that it's just going to have a baby, but will keep an eye on it also.