Round brown thing in my sump?

cpark645

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Any ideas on what this is? They’re all over the place in my sump.

IMG_5937.jpeg IMG_5938.jpeg
 
Looks like a sponge or algea
 
is it crunchy?
there’s some funky brown coralline algae that pops up in my tank sometimes

or if soft i’ve also had scroll algae pop up here and there
 
Looks spongie.

Can’t help but wonder, but do you have a more reliable thermometer that the stick on there on the sump?
 
When in doubt
Throw it out!
Round and brown
Flush it down.

The title of this thread
Got into my head.

I have no idea what this is but it’s interesting.
 

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