Thanks Rainman, I applied the lime last after the 4 hours it took me to spread the alum slurry all around my pond ( wow that was a lot of work). I didn't see any fish piping, and I thought I did a pretty good job of spreading it evenly( spraying with a garden hose using my trash pump). I had to treat this pond two years ago using alum, and didn't have any issues, however last time I did not use the lime?