Tube looking ID?

[zhanpromo2]

Please help with identifying these tube looking things

Very scientific description

 

[Hunna]

Sponges by the looks of it

 

[zhanpromo2]

Sponges by the looks of it

I didn't realize sponges have tubes coming out of them

 

[zhanpromo2]

Sponges by the looks of it

I got a lot of them. Leave them alone or need to treat them somehow?

 

[Justin Ranke]

I got a lot of them. Leave them alone or need to treat them somehow?

Leave them! Good to have in tank! Those tend to stay in shaded areas, so they won't bother coral most of the time.