Is this a sponge? Little white fuzzy thing...

[R2Dork]

Did some searching and I think this might be a little sponge that appeared out of nowhere. I'm happy to leave him if he's a good boy, but since this is my first marine tank and it's only a couple of months old, I'd like to run it by the experts first.

Here's some pics from two different angles with just the white lights on:

[WV Reefer]

9 minutes ago, R2Dork said:

Did some searching and I think this might be a little sponge that appeared out of nowhere. I'm happy to leave him if he's a good boy, but since this is my first marine tank and it's only a couple of months old, I'd like to run it by the experts first.

Here's some pics from two different angles with just the white lights on:

Hard to tell from pic but most likely a sponge.  

[Joevember]

Harmless sponge. Some stay in your tank forever, some disappear after the tank has matured.