What the.....

[ph33nyx]

I noticed this growing in my tank over the last week. It's been getting larger, but I have no idea what it is. Anyone have a clue?

It hard and about the size of a pencil eraser (closeup)

 

[bjohanson1234]

Type of sponge. I have a bunch of them in my tank. They grow, then recede, then grow again. They are fine.

 

[Bifferwine]

It is a sponge. :)

 

[Slimkasey]

Glad to hear its a sponge, thought maybe someone had a bad cold.

 

[chichimom79]

Glad to hear its a sponge, thought maybe someone had a bad cold.

HAhahahaha!

 

[RockStacker]

Mucinex won't get that out.

 

[Slimkasey]

That's good Rock!

 

[valasaraptor]

Hey! I've got one just like it!!