New growth on LR

[shorty2545]

I noticed this on my LR recently. Anybody have any idea what it is? It wasn't there a couple of weeks ago.

55 gal reef
Ammonia 0
Nitrites 0
Nitrates <5
Phosphate <.25
Kh 9
Cal 500
Mg 1480

 

[Dav3]

Sponge. Harmless filter feeder.

 

[shorty2545]

Ok. Thanks. I've gotten a lot of pineapple sponges growing in recent months, but haven't seen any like this