Is this sponge growing or something else.

Joined
13 Sep 2021
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Port Elizabeth
I bought a piece of Life Rock some months ago and was told there was a small piece of sponge on it.
They said it would die anyway due to exposure to air, light and the amount of nutrients & flow in my sump.
Is this perhaps that sponge or something else (slime, fungus, algae)? Tried to research it a bit but no nail on the head info.
Best photo's I could take deep down in the sump...
IMG_20220811_192502.jpg
IMG_20220811_192516.jpg
IMG_20220811_192812.jpg
 
Bottom pic looks like a type of sponge possibly.
 
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