is this sponge?

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CommanderInReef

CommanderInReef

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I had this orange stuff growing throughout my rock but now it's almost hairy in one spot. Any answers?

43B14240-116E-461F-AD65-710B1FB26D83.jpeg
 
www.dinkinsaquaticgardens.com
Don't think it is a sponge; research cyano, especially if it siphons off easily
 
Saltwater Aquarium

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