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View Full Version : Live Rock has big black spot??


Steve'o
07-04-2011, 12:30 PM
One of my Live rocks has a portion the size of a toonie that has turned from purple to black??? What could this be and should I be concerned?
If so how to get rid of the black and not damage the nice rock?
Thanks all,
Steve'o

parkinsn
07-04-2011, 02:38 PM
Sponge possibly? Have a look below.

http://www.reefcentral.com/forums/showthread.php?t=1140423

Post a pic if you can, will make it much easier.