What's this please?

[ZenGuitarGuy]

Noticed this growth on my live rock rubble. Does anyone know what it is? https://uploads.tapatalk-cdn.com/20170929/26c518aecd57786d72706c858288e6b1.jpghttps://uploads.tapatalk-cdn.com/20170929/4046cbe576e3b94dbe04ae938b9da7c4.jpg


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[crawlerman]

Not the greatest pics, but looks like sponge to me

[mcgyvr]

yep.. I'd go with sponge too

[ZenGuitarGuy]

Ok, thanks guys. I have pineapple sponges, but these are a little different. I assume they are still harmless?

[mcgyvr]

harmless..
sometimes sponges can grow/spread across corals,etc... (zoas most often it seems) but mostly they are totally harmless..