What is this growing in my tank?

[ChickReef]

Hello,

So my tank has been having some weird stuff growing inside of it. I’ll attach multiple pictures. Can anyone tell me what it is? It feels like a snail, it’s tough and it will not come off. I had one before, now I found a second one. Anyone ever seen these?

 

[Rmckoy]

Looks like some sort of sponge .
Is it hard like a shell ?

 

[olonmv]

Leaning towards tunicate.

 

[twentyleagues]

Looks to be a sponge or maybe a Tunicate.

 

[Stephen8169301]

Sponge I’ve had them
Mine was a pineapple sponge though

 

[ChickReef]

So how did I end up with a sponge and are they harmful? What is it exactly?

 

[Rmckoy]

A quick google
Search im Beginning to lean more
Towards tunicate or sea squirt

 

[Stephen8169301]

Nah but they can over take and go in darker places filter feeders at least for the sponge I had for me it just disappeared but people get them in there sump

 

[olonmv]

So how did I end up with a sponge and are they harmful? What is it exactly?

Don’t fret, It’s a sign of a healthy tank. They’re harmless filter feeders.

 

[ISpeakForTheSeas]

If there's two openings into it (two holes/mouths), then it's a tunicate; if there's just one opening, it's a sponge. Both are harmless filter feeders. The only time to be concerned over sponges is if they're growing over and smothering corals (or blocking equipment/plumbing).

 

[Rick's Reviews]

Weirdly, we as a community does not require any more photos lol

 

[ChickReef]

Thanks for all the information

 

[exnisstech]

The mystery arrivals are part of what has made this hobby fun for me. I had no idea when I started how many different life forms would be appearing. I think I have more cool stuff in my fuge than the DT