Hornwort as algae controller
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Old 02-01-2003, 01:28 AM   #1
BonesCJ
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I have read that Hornwort can be used as an algae controller and found this article at ThreeGuyAquatics.


"Ceratophylum submersum - Hornwort

In nature it is usually found buried in sandy to silty sediments where it anchors itself by modified leaves. Ceratophyllum demersum often forms monospecific populations and is found down to 10 m depth as individual very slow-growing plants. In the aquarium, on the other hand, it prefers relatively high light, and it does not tolerate transportation for extended periods. It excretes substances toxic to algae (allelopathic behaviour) and at good growth conditions it efficiently inhibits most algae growth. "

Has anyone tried this to see if its true? and if so how much would be needed?
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Old 02-01-2003, 03:06 AM   #2
Tom713
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I have hornwort in all four of my tanks. Two have no algae what so ever. The other two have some to a varing degree. In one of those, the algae is very minimal and not really a problem. However, my newest tank has been battling a mild case of green water almost from day one. This tank also has some very bright green algae that has grown on some parts of my driftwood. I don't mind that, it looks rather nice.

I have no doubts that hornwort can have a positive effect, but as you can see, its not a cure all.
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Old 03-05-2003, 05:32 PM   #3
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great to know
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Old 03-18-2003, 12:24 AM   #4
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The hornwort in my tank seemed to be a good place for algae to grow. The hornwort grew fast and at the surface was covered with algae. When I removed 90% of the hornwort the other plants perked right up. If hornwort takes nutrients from algae it has to also take nutrients away from the other plants. And when it is on the surface it also takes a lot of the light.
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