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Algae covered the top of the pond. The pond was full of algae.
If the population of algae in a pond dies, what will happen to the population of fish that eat the algae?
Yes, it is because without any algae some living animals in the pond would die. Algae can be food for some creatures in the pond. If your pond is just for admiring and not for living creatures, no, it isn't because the algae will take over the pond and no living creature is in it to eat the algae.
In a pond, there is no possible way of keeping an algae-free pond with fish in it. You can choose one or the other- A pond with fish and some algae or a pond with no algae and no fish. The chemicals needed to kill ALL algae would kill the fish. I have a pond with around 20 koi. I use Green Clean. It is a white powder and it kills most of the algae when it hits it. I find that PondCare Algaefix also somewhat works.
algae
you kill the algae
They eat the algae all around the pond.
No
algae
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The algae will reduce both air and light causing the organisms in the pond to die.
Pond weed is a weed that grows on the bottom of ponds.