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Discussion Starter #1
i just moved some of my live rock around and noticed a big glob of this white goo on the bottom, what can it be? it looks like it can have something living in it cuz it has a hole in the middle.
 

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Tunicates and sponges are two completely different types of organisms. Tunicates belong to the phylum Urochordata and sponges belong to the phylum Porifera. Neither are necessarily bad for a tank, but if a sponge is exposed to air, it will more than likely die and can really foul up a tank. The picture looks like it could be an encrusting sponge.
 
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