BEARjuice

this came on a piece of live rock, its been in my tank for about 3 to 4 months and it has not spread, it closes and opens quite a few times. i just want to know what it is and is it bad for my tank.

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sgould

Looks like a button polyp...a type of coral, not harmful at all. They're relatively easy to care for...moderate light and current. I wouldn't be surprised if it eventually started spreading, by splitting in 2.

http://www.liveaquaria.com/product/p...670&pcatid=670

BEARjuice

thanks

Angela_96

Congrats on the hitchhiker!! Thats def a paly/zo polyp!

Here is a good reference for hitch hikers:
http://www.xtalworld.com/Aquarium/hitchfaq.htm

Amanda

It's kinda cute, lol.
You got a two for one deal!
Good luck.

Phinny12

Very Cute!

Oil_Fan

Very nice indeed!!

Slug

Button polyp. Like said, harmless but can easily take over the tank if not weeded back some (Once it starts splitting).