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Spikey Ball Sitting on Live Rock. [Archive] - Saltwater Aquariums - Reef Tanks Online Discussion
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RichardP
02-02-2003, 04:38 PM
It's probably harmless and common, but I'm not sure what it is....

It's not a good picture, but it's about an inch in diameter, a yellow brown colour and covered in small spikes. It's also very stuck to the rock and not moved in the last 48 hours. (Since I got it)

Thanks.
RazerCorals
02-02-2003, 05:10 PM
I think its a sponge. I have one in my tank that I fragged. Mine is mostly yellow. Is it porous?
phistio
02-02-2003, 05:46 PM
i have tons of these all over my tank...i posted a thread on them..

they're harmless!! and signs of a healthy tank! :D