If you have a concrete pond that has not been properly sealed or is new, lime will leach out of the concrete. Empty the pond, scrub it with vinegar or a mild solution of muriatic acid (one part acid to 4 parts water). Refill, test the pH. (It should be around 7.0). Let the water sit for a day or two and test again. If the pH remains about 7.0, you may replace your anacharis.(Don't forget the dechlor.)
Anacharis likes to be in the shade. If it is in full sun, it may turn yellow and die. Shade the pond with floating plants and emergents. Use water hyacinths if they are legal in your state. They are legal to own, but illegal to sell in Louisiana. They were imported in 1884 to help keep the bayous clean. They do that indeed, but they now completely cover the bayous and are considered a noxious weed. So if you do use them in a tropical or subtropical climate, please throw them in a compost heap when they multiply, not in any other body of water. You can also use water lilies or any other floater that can provide shade for your pond. Some people build an arbor to keep the pond in shade for part of the day.
Make sure you have one bunch of anacharis per square foot of surface area of water. If you have less, the fish may be eating it faster than it grows. This is most important. I know anacharis is expensive, but if you buy it a little at a time, it will cost much more because you will have to keep replacing it.
Anacharis acts as filter, catching and holding suspended material in the pond. With anacharis your pond will stay balanced and crystal clear with no other filtration.
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