Please help ID egg sack looking thing

[Lou Raffael]

Hi,

I have a cleaner wrasse that went missing so I started turning up the rocks and found this egg sack looking thing. Can anyone ID?

 

[KJ]

Sponge.

 

[Lou Raffael]

Really? This was a dead dry rock. Should I get rid of it?

 

[KJ]

No It's fine, just a filter feeder.

 

[Lou Raffael]

I really don't think it's a sponge. It was a sack of some sort.

 

[Lou Raffael]

It reminded me of a dandelion when they have the seeds that fly off, it was a soft sack with pieces that would detach easily?

 

[truepercs]

First thing I thought was sponge when I seen the photo. Even more so if it was on underside of rock

 

[Tucker64]

Definitely a sponge. I have them all over my tank and it's only been up for 8 months. I used dead rock as well. They come on plugs as hitchhikers. It's a good sign though. As they grow more you'll start to be able to see more of the structure

 

[Bruzzerfish]

Sponges come and go as a tank matures, I typically see them in my tanks when the tanks are younger, but they appear every now and again