Help ID this

[lilkiwi930]

Curious if anybody knows what this? I believe when I touch it, it is slimy.

 

[Crabs McJones]

Sponge

 

[KingTideCorals]

Looks like a simple pineapple sponge, or sponge of some sort. Little beneficial filter feeder.

 

[Lovefish77]

It is a good sign that sponge is growing. In my tank it always grows on shaded areas, like underside or rock ledges.

 

[Crabs McJones]

It is a good sign that sponge is growing. In my tank it always grows on shaded areas, like underside or rock ledges.

Yes, very good sign. It means your tank is healthy and maturing