Sponge or????????

[ReeferRob]

Just picked up this clove polyp rock for LFS and on the underside I saw this green stuff. Never seen it before, I assume its a sponge of some type. Should I be worried, any suggestions. Treat or leave alone.
Thanks

 

[jc5205]

Hard to tell , but I would guess its an encrusting sponge, usually black. It can become very invasive and difficult to remove once established.

 

[TritonsGarden]

Just to make sure..... you might want to practice the first step in purchasing a coral quarantine for 30 days... it does not take alot just a small 10gal tank a power head and water changes. It can cause alot bigger problems if you dont!