Just no flowers. I have lots of fish for food
There may be too much nitrogen in the water, which may need to be adjusted. Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/watering/testing-water-for-plants.htm
https://www.gardeningknowhow.com/ornamental/water-plants/water-hyacinth/growing-water-hyacinth.htm