Identify

[SanFernandoValleyAIOReef]

Just started last month tank and has been dark (no reef light) with just 1 clown (started with 2 :( ) all rock is live rocks from an established fowlr tank & 2 pieces, 1 each from 2 lfs. one of the lfs rocks has something growing or collecting on it, can you tell what it is? Is it serious? It’s the only rock with it

 

[MossyFroggyLove]

I dont know what you are trying to show. Can you zoom in

 

[MossyFroggyLove]

If you are talking about the white hairy thing ( at least in the picture it looks hairy ) if its pineapple shaped, it is probably a pineapple sponge ( not serious ).