Cecil we use lots of K-tea even in low hardness but have had no fish kills from it, knock on wood. However I have a client, Nardelli (Home Depot) that has lots of lillies that sometimes get burned from copper app. I have seen Green Clean work but overall have been disappointed so far in its effectiveness on filamentous algae. Let me know how it works for you if you try it out.


Greg Grimes
www.lakework.com