"Daniel Prince" wrote in message
...
My brother bought a shell at a shell shop (not an aquarium shop).
How do we clean it so that it will be safe to use in a goldfish
tank? Thank you in advance for all replies.

Is it a real shell, unpainted? If so you can just boil it for a few minutes
to make sure there aren't any nasties living in it. If it has paint or any
kind of sealer on it then don't use it.