Weird white spongey stuff growing on LR (identification pleae)

[BertuzziBreaksNecks]

I didn't think much of it when I bought this mature live rock, but now it seems to be getting bigger and spreading to other rocks? What is this stuff!?

Thanks

 

[cashmoney6980]

I could be wrong, but it looks like its just a common type of sponge! Not a bad thing at all to have. It feeds off particles in the water and can slightly help with water quality

 

[BertuzziBreaksNecks]

I could be wrong, but it looks like its just a common type of sponge! Not a bad thing at all to have. It feeds off particles in the water and can slightly help with water quality

Well thank you. That's refreshing to know I don't have something bad and crazy growing