What the. .....?

[Alf500series]

So I got home this morning and found this foamy looking stuff on my frag. Any idea on what it is? https://uploads.tapatalk-cdn.com/20170120/8fe20a942513afe589aa6eb9fafc0b52.jpg

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[ethuman]

Sponge possibly? No expert though

[75mixedreef]

Frag looks dead so I would agree with sponge or possibly a mat algae.

[Alf500series]

Sssooo is it bad

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[garethwood]

sponges will grow on dead skeleton and rockwork. and ide agree that the frag you have is well dead.. that substance looks abit to dense to be sponge tho and sponge wouldnt of grown while you were at work unless of course your on a tour of duty ; )
sponges are good filter feeders and considered a good edition to your tank. have you poked it? is it soft and porous ie like a sponge.. or is it slimey? it could be a mold/fungus? its difficult to say from a picture alone.. your best bet is if it grows quick then take it out : )

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[Alf500series]

I didn't mess with it much I just removed it. Wow, it smelled horrible what ever it was.

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