White Feathery Stuff growing at the bottom of live rocks

[wettfox]

Hi! Can someone help me ID these please? Are they safe? They've been growing a lot at the back of my live rock where there are no direct light.

Been reading about small feather dusters, but need confirmation

Pic here:

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[chaudhry]

Pinapple sponge!
Good thing to have, sign of a well established tank.
Harmless!


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[DancingShark]

Yup, i have them all over my sump.

 

[wettfox]

Ohhh.. cool! I shouldnt worry about them? They're growing a lot behind the rocks. Havent seen any in my sump, though


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[Ron Reefman]

They are filter feeders and good for the tank. But more often than not they go away as the tank matures. Most (99%) sponges are very difficult to keep in a marine tank. They typically die off over weeks or as long as several months.

 

[wettfox]

Thanks for the responses, everyone! I can sleep soundly now


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