Thanks for the advice. You are correct on the FA. The odd thing was when I took a water sample to send in I waited until the FA was in full swing so I could see what was causing it. When I got the results back everything was normal. Either bad sample collection or water chemistry must have changed before I pulled the water sample. I know I tried to kill the FA before I cut all the Sago out with Cutrine Plus, but it didn't seem to work. I mixed 2 parts Cutrine to 1 part water. Granular has seemed to work best in the past. My biggest hang up with granular is inconsistent application. I have tried a hand spreader but that doesn't seem to work very well (hard to dial it down far enough). I end up hand spreading it and that is real hard to spread evenly. I hate adding copper to start with and only use it when the FA starts to win the battle. Thought maybe the Sago would use up enough nutrients to choke out the FA, but they seem to grow good together. I would gladly take Sago over FA any day of the week.