Does anyone know what this is?

[chrisfrontier]

This just showed up in my tank about 1 month ago. It doesn't move, but doesn't seem to go away.

 

[smokinreefer420]

The thing on the top is a type of sponge, but not quite sure what kind. They are beneficial I don't know whats on the second pic though.

 

[romunov]

Happy reading:

Sponges
How to ID a sponge and why should you just call it what it is - a sponge
Sponges: A Bunch of Holes Held Together by Some Cells
Sponges - pump-filter modules through space and time
Some Truths about Sponges

 

[reefgrief]

Could it be a sea squirt ? Dont recognize sponge variety, so it could be a sponge, but most that i have seen are opague, and that looks clear. Perhaps in a month this will become more defined. sponges or squirts are reef safe, so probably no need to worry

 

[romunov]

It's a calcerous sponge (see second link I provided a few posts back).

 

[Drix]

The first one is definatly a sponge, I'm not sure of the technical name but they're refered to as pineapple sponges (for obvious reasons) Theres prolly a few posts here on them.

The other picture does not look familiar to me