Alien egg in my tank

Ignotus

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I have had my aquarium for about a year now and everything is going great in it (except a decorator crab that likes to cut up some of my plants) and a black alien egg that has recently burst.

I have seen the little guy back there since I started the tank but just assumed it was a black marble that was somehow grown into the live rock. As I was away for a 5 day backpacking trip I don't know when it burst but all that's left is a thin transparent shell. It has gotten bigger over time but I assumed it was a difference of angle being as I moved the particular rock it was residing in/on.

There have been no apparent changes in the tank and I have not seen any new life forms or inhabitants.


Any one know what just happened, or what this is/was??:ooh:

I will post a.. Um... Post burst pic tomorrow.
 

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