elephant noses used to be used to test water quality... go research it, you will see. another EXTREMELY sensative fish, period.
edit: btw, neither of those articles explains the vigor you are using on this topic, the second article even says you can't use table salt and that makes the rest of it suspect.... i like rtr's article better and will find the link for it later if i have time. it's on tomsaquarium site i think under articles...... i don't understand the reaction here and i don't have the time to dig up the references for the stuff that i have read. want me to send you my bookmarks? maybe you can find the specific link in the several hundred that i have.