ID black growth on hammer coral

[saltyreefer]

What is this?
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[glxtrix]

looks like some type of sponge.

 

[lant]

Looks like Chicken Liver Sponge. Plakortis species.

 

[saltyreefer]

Is it reef safe? Do I need to get it off the hammer? It hasn't been doing very well.

 

[glxtrix]

Sponges won't cause issues. How's your water testing?


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[jennm]

Agree it's a chicken liver sponge.

I'd say that coral is close to dead though. The sponge is not the likely cause. Looks more like a Torch coral not a Hammer (both are Euphyllia sp.)

What's going on in the tank? Parameters, etc?