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Originally Posted by xycose
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I just got those myself the other week
As Sugar Magnolia said, harmless sponges.
You also might find little ones that are oval-ish with a brush sticking out the top. Those ones are Sycans (Pineapple Sponges).
I find it interesting yours are directly in the open. All of my sponges only came about underneath the tops of the caves I have, none on my rock in the open.