Can someone ID this growth?

[pbenjbear2]

We are discovering an abundance of these white "whisker" like things amongst our rocks. Our tank is currently fallow except for our CUC which includes 2 peppermint shrimp added 2wks ago for an aptasia we discovered. Wondering if this is the start of an aptasia population?

 

[hyprc]

Almost looks like some type of macro algae slowly coming back. Not sure about the round spots in the first pic. Lets hope not some type of caulerpa.

 

[Mike N]

First picture shows pineapple sponges. Second shows white sponge growing.
Nothing to worry about. I think the pineapples are unsightly, but they typically stay out of the light.

 

[Eagle_Steve]

Those are sponges. First pic kinda looks like pineapple sponges. Google them and compare to what you have.

second pic looks like a sponge I cannot remember the name. If they are white and kinda stringy looking with new runs branching out, then they are what I am thinking of.

Both are harmless and will self regulate with their population. The white stringy ones can annoy things by touching them, but they don’t actually hurt anything.

 

[pbenjbear2]

Thanks so much - super appreciate the info!