What is this?

[Shep]

I need am ID on thia pinkish white stuff I saw in my fuge. Sorry if this is the wrong area for this but its not an invert, plant or algea as far as I know.

 

[Mike J.]

Scroll down in this article to Tethya.
Aquarium Invertebrates: A Look at the Sponges ? Advanced Aquarist | Aquarist Magazine and Blog

 

[Shep]

Close but this was really thin and had no real body to it, it looked like a layer of slime had come off the tank and was waving around.

 

[kendavjac]

Are you carbon dosing? May be a glob of bacteria

 

[Shep]

Are you carbon dosing? May be a glob of bacteria

I am, did not think of that.