What is this??

R3verb

Time to add some coral!
Hey guys. Tried to get a good picture of this but was having trouble so I hope these pictures help. I have Live rock in my tank and these white tube-like things are growing on one of them. Is the algie or something else?
 

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Probably nothing to worry about. Can't really tell from the pic but if it's fuzzy looking it could be a sponge or a tunicate.
 
This is a harmless Scypha sponge. They are very small, and usually found in our overflow boxes and down in the sump. Attached to rock, glass or acrylic or even your plumbing, they may be about the size of a grain of rice or perhaps larger
 
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