ID help ?

[Bucs20fan]

Not a clue what this is, but it grows pretty fast.

 

[Bucs20fan]

Bump

 

[ISpeakForTheSeas]

Sponge - harmless filter feeder (if it starts growing over corals, there are a number of ways you can remove it, but most sponges are totally harmless).

 

[Bucs20fan]

I’m familiar with pineapple sponges never seen a sponge like this before.

 

[ISpeakForTheSeas]

I’m familiar with pineapple sponges never seen a sponge like this before.

Yeah, sponges are a pretty diverse group despite their simplicity. I’ve seen a few of these guys in different threads on here, but they’re definitely not as common as pineapple sponges.

Edit: while not necessarily an exact match, if you look at images of the search “spaghetti sponge reef tank,” you’ll find a few that look similar to this one.