How does the new pond owner judge how safe a good �healthy� pond is? Is it sufficient that the pond looks good and the owner likes his pond? Are daphnia present in all good �healthy� ponds? If the healthy pond has no snails, and you're stocking RES, would it make sense to add snails? And if it would, how would you go about finding �safe� snails? I've never seen snails in my old pond, but the pond I have now has them and nice sized RES.
