Please help identify mystery creature in Sump

stevoiii

New member
These things look like flat worms which I have had in the past but they seem to large to be worms. Also they are like "shells" for something to hatch instead the actual creature/bug. They seem hollow when you feel them. Does anyone know what these are? Thanks for your help in trying to figure out what these are.
 

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kfisc

Well-known member
Looks like sycon- or pineapple sponges. Every tank I've had gets them; they're completely harmless.
 
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