Sometimes at auction in the North-West phosphoric acid is available. Now, I'm not too sure of the legalities of this but, if you buy any I doubt anyone will tell. Just be very careful with it. Dilute one ml into 100 mls and add it a few mls at a time, testing constantly. If anyone asks I'll deny all knowledge of this statement. It was a fit-up. Pete Liptrot Bolton Museum Aquarium Le Mans Crescent, Bolton BL1 1SE 01204 332200 ------------------------------------------------------------------------- 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"!