What is this

[Ryanwoodz]

Hey does anyone know what this is. I found some in my tank and this one in the back.

What is it?

 

[Amphiprion]

Looks like a sponge of some sort to me.

 

[chefjamesscott]

dry or wet tank

if dry looks like some kinda cocoon if wet i have no idea

 

[Ryanwoodz]

Its wet, filled with water. Active tank.

 

[Ryanwoodz]

Anyone else???

 

[Reefscape]

I would agree with Amphi....looks to be some kind of cocoon....What do you have in the tank? a complete list of fish, inverts etc etc would be a good help..

 

[Ryanwoodz]

Clown fish, halloween crab, mexican turbo snails... thats about it.

 

[BadRoma1]

sponge eating worm or a nudibranch?

 

[speedykeys]

Yesterday I replaced the sponges in the back of my tank with live rock rubble and found a bunch of those in the sponges. At first I thought they were just clumps of old mysis or something but then realized it wasn't. I still have no clue what they are but I've had them in the back of my tank for a long time with no problems.

 

[Almondsaz]

It is a bit difficult to confirm from the picture you provided, but when you said that you had a bunch in the sponge that you removed, I would almost be certain they are "pineapple sponges". They appear when the nutrients are high and are filter feeders, more a nuisance in their numbers but not becuase they are distructive. NOte the "Weird little White Thing" portion of the linked thread http://www.wetwebmedia.com/spgidf6.htm. Hope you find this useful.