Any idea what this is?

[AbjectMaelstroM]

Doing some tank maintenance this morning and saw this in the return section.

Good or bad?

 

[rwreef]

Looks like a sponge, not sure what type.

Also..harmless

 

[Idoc]

Looks like a sponge

 

[AbjectMaelstroM]

Sounds good, I'll let it be. Thanks, all!

 

[bsr2430]

I also had one, was fairly close to the same size. Pretty cool looking how it grows!

 

[vetteguy53081]

Poriferan sponge. because it is in sump, it will benefit as a filter feeder. They can get evasive in the tank itself.

 

[bsr2430]

Poriferan sponge. because it is in sump, it will benefit as a filter feeder. They can get evasive in the tank itself.

Can they really? Crabs will hopefully keep them down!haha