Coeal ID

[Alex2211]

Was shufflung my stones found this at the bottom of one of the stones.
What is it and is it safe?

Tnx
Alex

 

[Troylee]

Sponge.. harmless, filter feeder..,black ones can over grow stuff..

 

[Alex2211]

Sponge.. harmless, filter feeder..,black ones can over grow stuff..

Thank you
It was quick

 

[Cthulukelele]

Was shufflung my stones found this at the bottom of one of the stones.
What is it and is it safe?

Tnx
Alex

Not only are they harmless, they're a sign of a healthy tank if they're growing well, and as they grow they also help buffer changes in dissolved organics (nitrate, phosphate)