What is this.... ?

[jazzmik]

Not sure what the growth is on the bottom side of hammer...

 

[Coralreefer1]

Sponge

 

[jazzmik]

Is it anything I need to worry about or do something with?

 

[jazzmik]

I thought it was growing feom the hammer itself

 

[LIreefguy]

Nope sponge are harmless.

 

[Coralreefer1]

No, sponges are filter feeders and help with water quality plus it won’t inhibit your Hammer from growing or opening up.

 

[jazzmik]

Thanks!