Found this in tank

[Kilo]

Anyone know what this is?? They almost seem like sponges but idk
Tried to put a light on em to see if they open.

 

[DEWreefing]

Sponge

 

[joseserrano]

Sponges

 

[Jimbo327]

I have it all over my sump as well. They are sponges.

 

[jessesoto33]

Sponges harmless but an ugly sight, and they take over fast. You have to manually remove them.


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[five.five-six]

Bob

 

[five.five-six]

Square

 

[AlphalClownFish]

Sponges. Nothing to worry about!

 

[maikoa02]

Get an angelfish and they will devour your sponge. But they might also devour your zoas, clams, and any meaty corals like acans.

 

[ilyad]

As others have said, it is a sponge. Since that one is out of water, its hart to tel for sure, but it sure looks a lot like some of them are a pineapple sponge. I have a bunch of these in my overflow and some in the sump... when I turn my return pump off and then back on, a bunch of them come loose and go into places.

 

[laverda]

Exposure to air kills most sponges.