Aviel, Dr. Morin of Seachem had some correspondence on the AP mailing list about gluconate vs. EDTA. I believe they use gluconate in Flourish, and they feel it is superior to EDTA. See: http://fins.actwin.com/aquatic-plants/month.9811/msg00474.html You can also search their database with "Morin prime flourish" and get more e-mail on the subject. Here in USA we use Greenlight Stump remover, which is KNO3. Regards, Steve Pituch ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/