What is this on a live rock?

Tammylas · Jan 13, 2023

Anyone have thoughts about what this is growing on one of our live rocks? It’s in our 180 gal tank. Is this possibly an egg sack of some sort? Tank is stocked with fish, shrimp, snails, an urchin, conches, and a hermit crab. Also a few pieces of hammer coral.

Fishy212 · Jan 13, 2023

Looks like a sponge

WELCOME TO R2R !!

Tammylas · Jan 13, 2023

Fishy212 said:
Looks like a sponge

WELCOME TO R2R !!

Thank you!

Afkomjorgen · Jan 21, 2023

Tammylas said:
Anyone have thoughts about what this is growing on one of our live rocks? It’s in our 180 gal tank. Is this possibly an egg sack of some sort? Tank is stocked with fish, shrimp, snails, an urchin, conches, and a hermit crab. Also a few pieces of hammer coral.

I have these too! They don’t seem to bother anything or grow quickly in the last 3 years.