White things growing on glass and rocks

[maxpare79]

Hey guys can someone tell me what are these little white things growing everywhere in my tank? It's an AIO and it started to grow on the glass of the back chambers, now it's growing on the rocks too

 

[maxpare79]

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[Flux Capacitor]

Pineapple sponges. They are good filter feeders, they will die off over time.