Looking for help identifying these

[barry28]

Looking to see if anyone has any idea what these two things are. One are these fuzzy balls that are on the underside of live rock and in every hole. I don’t see any on top of the rocks that are exposed to direct light. I also now have something that looks like white fuzzy/stringy/cotton like algae. Both are only on parts of the rock that are not exposed to direct light. Any help and resolutions would be much appreciated.

 

[StatelineReefer]

Pineapple Sponge!!! harmless filter feeders, but usually go away after a few months regardless of how well you keep the tank

 

[ISpeakForTheSeas]

I don’t see any cotton-like algae, but I do see sponges. There’s definitely pineapple sponges - you may have another kind too (I can’t tell from the pics), but you for sure have pineapples.