[MonkeyTypeRS]

So I was wondering if using clam shells from local water sources is safe as long as i boil them before introducing them to a tank?

also is there any diseases i should worry about when doing this?

now for rocks

what are the types to avoid other than shale or sediments that are brittle and sharp?
specifically other than fools gold (heard it was because it has sulfur in it)
which rocks are poisonous?

 

[MonkeyTypeRS]

wouldnt vinager be a safer choice than bleach?; since its acid it kills bacteria also
and i dont believe residual would be harmful in a tank as long as you do a water change no more than a day later