What is this??

[Blakepher]

Does anyone know what this is stuck on one of my live rocks? I have 1 yellow tail damsel, two clownfish, snails, and hermit crabs in this tank.

 

[EeyoreIsMySpiritAnimal]

It's a sponge. Nothing to worry about

 

[Blakepher]

It's a sponge. Nothing to worry about

Oh good! Thank you!

 

[WheatToast]

It's a sponge. Nothing to worry about

+1
Normally a harmless filter feeder.

 

[Goby Bryant]

+1 good for tank imo