Several people asked about what was in the fertilizer I used to pamper/kill off my BGA, and wanted to know if copper was one of the ingredients. I forgot to write down the ingredients last night, but took a quick glance as I ran out the door this morning and it does indeed contain copper, a 0.05% chelated copper. I have added a total of 2 tsp. for 45 gals. of water. Neither the fish nor the water hyacinth nor the water lettuce appear stressed, but needless to say I won&＃39;t be adding that fertilizer again. Tonight I&＃39;ll change 1/3 of the water, and see how the BGA reacts. After an initially rapid decline, the BGA has continued to slowly disappear from the remainder of the tank. If the water change revives the BGA again, I&＃39;ll try another fertilizer, one without copper. And I&＃39;ll try to remember to write down all the components of Epiphytes Delight for those who asked.