is petrified charcoal safe to put into an aquarium??
I found a really nice small piece of petrified charcoal!
.. at least.. thats what i think it is.
Does anyone know if this would be safe for aquarium useage or would it eventually leak posion?!?!
its surprisngly lighter than it looks and the grain seems to be running all one way.
Any info would be great! ive had no luck on google..