Keeping red plants red? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 11-24-2003, 04:08 AM Thread Starter
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Ok, I have done some water testing in my aquarium.

Values
light: 2.75 wpg
co2: 30ppm
iron: 0.5ppm
nitrate: <5ppm
phosphate: trace

My question is about the addition of phosphate. My red ludwigia isn't very red. I am wondering if phosphate is limiting it to be rather green? Has anyone else experienced this?

Thx.
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post #2 of 7 (permalink) Old 11-24-2003, 04:43 AM
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My ludwigia, and other red leaved plants, reddened up nicely with the addition of some extra potassium. There are several potassium sources depending upon your needs... check out any of the several posts here on the subject for additional information.

Good luck!

Tim

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post #3 of 7 (permalink) Old 11-24-2003, 12:31 PM
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Also the color temp of your lights can make a huge difference.
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post #4 of 7 (permalink) Old 11-24-2003, 04:49 PM
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I agree with Rex about the colour temp.... My Red plants redened up considerably when I moved them under 5000-6500k lights...

Now to be fair.. I dont know if that had anything to do with the added intensity of the lights either, as the plants were moved from around 2 watts to 4 watts per gallon, in a shorter tank too....


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post #5 of 7 (permalink) Old 11-24-2003, 11:23 PM Thread Starter
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Color temp is 6700 k. I may try addding some potassium and some phosphate, when I get my supplies. I will be sure not to OD the PO4.
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post #6 of 7 (permalink) Old 11-24-2003, 11:25 PM
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Quote:
Originally Posted by GDominy
Now to be fair.. I dont know if that had anything to do with the added intensity of the lights either, as the plants were moved from around 2 watts to 4 watts per gallon, in a shorter tank too....
That's definitely an effect of the added intensity rather than the spectrum involved. At 4wpg in a shorter tank, even green light might make plants redder!
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post #7 of 7 (permalink) Old 11-25-2003, 02:44 AM
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I have found that keeping my nitrates a little above 5ppm has made my plants appear redder.
Also, when I switched out my 10000Ks for the GE 9325Ks, my plants looked a richer red. Less magenta in color.

Mike

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