Need warm-water plants for koi pond?
Hey guys, I was looking at other koi pond plant help, but I have a little trouble with temperatures and such. The thing is, I have an 800 gallon koi pond with no koi yet, but I live in Hawaii. Im a little concerned for the water temperature, especially the oxygen levels. I live in an area that is usually sunny, but my house gives it some shade for about half of the day. I was going to use some water hyacins (forgot how to spell) and some lilies, but I still need a plant that can oxygenate the water more (preferably at night) so that they stay healthy. Im 15, so budget is a problem sometimes. Any advice is appreciated :)
Answer by Aaron
No plants will oxygenate your pond at night unless you have a light over the pond. That's the thing about PHOTOsynthesis, it needs light for the plants to make sugars and oxygen.
I'm not sure what plants are available to you in Hawaii. I know the state is a lot more restrictive than most about non-native imports. Some you might look into are hornwort, Myriophyllum, Ludwegia, and Anacharis. Water hyacinth, water lettuce, and tropical water lilies provide shade for the fish with their floating leaves, so that might also help keep the water temperature lower. Water hyacinth and water lettuce also reproduce quickly, so only a few plants are needed.
What would work to oxygenate your water even more than plants is some type of fountain or waterfall. Even if it's just a powerhead or small submersible pump to pull water from the bottom of the pond and either shoot it a few inches above the surface, or pump it up behind some rocks so that it flows over a flat rock then flows back into the pond. This can be the return for any filtration for the pond, too. You just have to protect the intake so that it keeps out leaves or any debris that might fall into the pond. What you want to think of here is in terms of circulating so that the water at the bottom and the water at the surface (where oxygen gets dissolved) are constantly circulating and don't become stagnant. It doesn't require a lot of splashing or bubbles, which most pond plants don't care for anyway.
And if you get too much of a plants, don't just throw it out for the sake of not introducing non-native plants. Put what you don't want into a plastic bag, then put the bag into the freezer overnight. Then you can compost the plants or toss then in the garbage. But freezing ensures they can't survive and spread.
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