We just had a pond built its a half acre pond should be 10 feet deep when full its about half that now. We hit a couple of springs when we dug so its filling pretty fast we have had it for 13 days. After the pond was built the builder told us to seed and fertilize with 12-12-12 fertilizer so we did. We also got some fat head minnows the first week. It has rained a couple of times since the seed and fertilizer was put down and now the pond has an ugly green mucus looking stuff on it and the minnows are dying what can we do to fix this? Thanks for any suggestions will be appreciated