Are these sponges?

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peewee5779

peewee5779

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Are these yellow clumps growing on the back of my rocks sponges? If so do they have a specific name/type?
20251114_161526.jpg
20251114_161500.jpg
20251114_161616.jpg
 
BRS
Yes, they have a specific name but I don’t know what that is.

My main server got burned in the 70’s by frequent exposure to Disco and stuff
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