Found this on my mushroom frag

Brenner Baxter

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I have no idea what this is but i noticed this last night.

20210805_010937.jpg
 
BRS

Tired

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It looks like a pineapple sponge. If it's in the water, does it have a bit of a fringe on top, like a white pineapple? Definitely some sort of sponge.

Pineapple sponges are harmless filter-feeders. You might get a surge of them in a newer tank, but they'll settle back down on their own. You mostly see them in sumps and filtration compartments once a tank is established, sometimes tucked around the underside of the rockwork. Totally harmless to corals, which will just grow over them.
 

Mibu

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They aren’t harmful, but they are as sure as heck invasive.

I’ll get a picture of the rock work in my tank, to show you all of the pineapple sponges.
They love new and filthy aquariums. They will flood drain pipes. But the only thing you can do, is clean the pipes. So, even if he removes that one, they will still be in a cryptic/dirty zone. They do a great job at helping.
Now encrusting sponges can really become a problem.
 
Fritz

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For my 2 cents leave them. They are filter feeders and provide good cleanup and will only generally inhabit dark out of the way spots. They tend to go a bit nuts in new tanks but will die back on their own in time.
 

James_O

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They love new and filthy aquariums. They will flood drain pipes. But the only thing you can do, is clean the pipes. So, even if he removes that one, they will still be in a cryptic/dirty zone. They do a great job at helping.
Now encrusting sponges can really become a problem.
What’s the difference between a encrusting sponge and a pineapple sponge?
 
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