White tubes invading tank

[Nicksaquatics]

What are these tube things? They are starting to invade my tank’s sand and rocks.

Are they dangerous? Does any critter eat them so I can get rid of all of them?

Thanks you for your answers.

 

[Oscaror]

What are these tube things? They are starting to invade my tank’s sand and rocks.

Are they dangerous? Does any critter eat them so I can get rid of all of them?

Thanks you for your answers.

Look like some sort of sponge, never seen it before though. Shouldn't be a problem unless you don't like how they look

 

[reef lover]

Thats a weird one...

 

[Gareth elliott]

The petco near me has sponges that look just like this all over their rocks. Largest was about 1cm wide by 8cm long.

I would have more info but they wouldnt let me buy them, wanted to test if was something i could easily culture to feed a sponge eater lol.

 

[KrisReef]

The animal on the rock looks like a tunicate. Are the animals in the coral gravel the same?

And they are a non-lethal filter feeder of some sort.