Please identify this creature for me white ball in live rock

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Is this invasive, bad for my tank?

  • What is it?

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  • It moves very very slow if it needs to.

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Jonaripri

Registered Member
Original poster
Aug 7, 2015
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Can someone please tell me what this is. Appeared in my tank beneath dark area of live rock. 90 gal saltwater tank with only foxface, yellow tang, two breading pair clowns, sea urchin, cardinal, some red leg crab -shelled , coco worm (feather duster). This picture is magnified....Tank ball like spike.jpg
 

fsn77

AC Moderators
Staff member
Feb 22, 2006
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It does look sponge-like. Considering it was in a dark part of the tank, I'd lean towards that.
 
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tanker

Josh Holloway--Be mine!!!
Sep 1, 2003
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It is a type of sponge. Safe.
 
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Jonaripri

Registered Member
Original poster
Aug 7, 2015
3
0
1
Can someone please tell me what this is. Appeared in my tank beneath dark area of live rock. 90 gal saltwater tank with only foxface, yellow tang, two breading pair clowns, sea urchin, cardinal, some red leg crab -shelled , coco worm (feather duster). This picture is magnified....View attachment 215837
....Yes...thank you all for your response, I was able to find out it is a Pineapple Sponge.
 
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