What is this marble looking thing?

[untamed]

Some people have trouble with valonia...some (like me) do not. I have it in my tank, but you would need to look pretty hard to find it. It is possible that one of my fish eats it.

[Aquattro]

Originally Posted by untamed

Some people have trouble with valonia...some (like me) do not. I have it in my tank, but you would need to look pretty hard to find it. It is possible that one of my fish eats it.

I have a couple as well, but I do know my sailfin eats it if she can reach it.