Can you ID please?

[twhaddon]

Does anyone know what that black substance is? Moved the rock today and found a few spots underneath the rock. Thanks
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[tbub1221]

Hard to say , did you happen to touch it or remove any to give a description of it.

 

[clay4au]

sponge

 

[raz0945]

Sponge, you will find then in all different colors!

 

[twhaddon]

Not bad, right?

 

[jennm]

"Chicken liver" sponge.

Not harmful, some consider it unsightly. Good filter feeder. Unless it proliferates a lot, I'd leave it be.

Jenn

 

[twhaddon]

Then I will leave it alone - thanks!