Bad news fellas, a few days after all the rain my pond water seem to turn blackish tent and found 8 dead perch floating. I have a few areas on my property that do not drain well and continued to trickle into the pond. . This water trickle if too was very very dark (almost black)

Well we just got hammered again today with 3 inches of rain and more expected this weekend. Anything I can do to prevent a major fish kill or any suggestions what happen to cause these perch to die?

I was only feeding once a day for one second before the fish kill. Since I have upped the feed to twice a day for 3 seconds each time.