Dear Bob, Thank you very much for this very enlightening explanation on Water Chemistry! One item that I did not get much information on was Conductivity of water, how much is high conductivity and what is considered low conductivity? Could you also give me example by means of numbers so that I could be guided? Thanks once again. Edison ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!