Please ID

[kaseykagan]

 

[kaseykagan]

This thing is about 1 inch in diameter and has been in our tank for about a year. It has 3 small holes that appear to be mouths, however we have never actually seen it take in food. It don't seem to be any harm and has not spread. We are just curious as to what it is!

 

[kaseykagan]

 

[meowzer]

a sponge would be my guess.......

 

[megn25]

I was thinking a sponge also.

 

[kaseykagan]

So it is harmless right?.... are those holes mouths and do it actually feed? Are they any benefit?

 

[jstdv8]

filter feeder