Spongebob Invasion?

I’m fairly new to the aquarium scene. We did some rearranging of our live rock when we added some soft corals. We uncovered one of these little guys and didn’t think much of it. (Always fun to see the different life that pops up.) Well about a week later, (today), I noticed 3 more popped up and figured I had better seek some help. Also, I want to know if it’s something I need to start controlling. They are attaching themselves to lower light areas and on the undersides of the rocks.

Can anyone help identify these? They appear to be a type of sponge, not really sure though. I can try to take better pics if needed. Any help would be greatly appreciated.

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Thanks!

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Spongebob Invasion?

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