No. of Recommendations: 1
I've been in the pet business for over 15 years, and it is unwise to have crawfish in a garden pond. They are active predators against fish and will grab them as they swim by every chance they get. Finding little fishheads floating around after a crawfish feast would be unsettling.
When the hyacinth and lettuce dies back this fall, it would be best to remove all of the dead material yourself before it decomposes. There is a small chance it would come back, but the pollution caused by the rotting plants would cause more costly damage than the cost of replacing them next spring.
Anacharis (Elodea densa) is a good oxygenator and salad for your comets. Go very light on feeding the fish for the first year to avoid overtaxing the biological system of the pond with extra waste.
Try to find parrot's feather (a plant); it will survive the winter, it floats so it provides cover for the fish, and it's pretty. Don't forget potted plants like lilies (use hardy, dwarf varieties), arrowhead, umbrella palms, elephant ears, etc. They give you vertical interest. This would only be practical if the pond were 12" deep or more, which is a bare minimum anyway. Any more shallow will result in dramatic temperature fluctuations during the day which will stress the fish.
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