Sorry typo. I meant to ask about EDDHA, and only remembered HEEDTA. However, wait a minute - The tropica master grow seems to contain HEEDTA. Confused ... Michael ____________________________________________________________________ Dr. med. Michael Irlbeck | Zirler Strasse 15 | Tel: +49 89 713861 D-81377 Muenchen | CompuServe: 100277,343 Germany | Internet: u721aa at sunmail_lrz-muenchen.de ____________________________________________________________________