Hitchhiker Sponge - need help with an ID

hey guys
so I have a 28g nano reef and it is 13 months old.
I have noticed that I have a yellow sponge growing like crazy in my tank. The weird thing is, is that I have never had success with sponges before. I have never had a sponge in this particular tank.
yesterday I was cleaning the tank and noticed what looked like weird kind of cyano but when I looked closer, it was a sponge. I can see the clear tubes opened up filtering water. This sponge has spread all over this rock.
Does anyone know what kind of sponge it is?
Really cool how stuff just grows out of nowhere.
 

btldreef

Moderator
I'm honestly not sure, I'm on my phone so the picture actually looks like algae to me (so much for apple image technology lol). Hopefully someone will chime in with an idea.
 
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