Sorry, i forgot to mention the name: Dragon Liquid Chelated Iron made by Dragon Corp. P.O. Box 7311 Roanoke, VA 24019 It was $4.59 for 1 Pt and i calculated that for .3ppm Fe i would have to add appx 9 drops to my 29 gal aquarium (est. volume of 25 gal.) Or add 4 drops for a 40% water change. I did this this morning and the fish were just fine today! We'll see..... beth