High phosphate & low nitrate: lighting related? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 07-25-2018, 01:44 PM Thread Starter
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High phosphate & low nitrate: lighting related?

Hi All,
It seems I can't have my plants to look great, struggling for almost a year now.
I run CO2, daily dose of the Aquascaper fert (now switched today to Tropica) as I noticed that my phosphate level stays high since I'm using this fert.
Over 6ppm PO4 and nitrate below 5.

Few questions:
Can light intensity affect the way plants absorb phosphate? If so how?

I'm always wondering if my light is either too strong or not enough, looking at the before photos what would you say?

Water change 40% weekly (25L) is it ok or too much?

Thanks
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post #2 of 6 (permalink) Old 07-25-2018, 02:04 PM
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I'm looking at your drop checker in the first photo, it's blue. Have you measured your KH, and measured to make sure you're getting a 1 degree pH drop after CO2 has been running for a few hours?
What nitrate test are you using?
What light are you using, and for how many hours is it on?

Please provide the following water parameter - GH, KH, and nitrates
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post #3 of 6 (permalink) Old 07-25-2018, 02:26 PM
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Your Ambulia tells the story: too much light and not enough N.
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post #4 of 6 (permalink) Old 07-25-2018, 04:03 PM Thread Starter
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Quote:
Originally Posted by mgeorges View Post
I'm looking at your drop checker in the first photo, it's blue. Have you measured your KH, and measured to make sure you're getting a 1 degree pH drop after CO2 has been running for a few hours?
What nitrate test are you using?
What light are you using, and for how many hours is it on?

Please provide the following water parameter - GH, KH, and nitrates
The PH vary between 7.3 to 6.6.
I use JBL test.
The light is a ViparSpectra 165w with freshwater LED board.
I run the white at 15% and the blue red at 10%.
Here is a photo of the drop checker 6hours after co2 started.

Here is the light

Last edited by Darkblade48; 07-28-2018 at 04:39 PM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #5 of 6 (permalink) Old 07-28-2018, 08:32 AM Thread Starter
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I increased the CO2 to 1.7bps and the light now with white at 40%.
Plants started pearling, I guess that's a good sign
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post #6 of 6 (permalink) Old 07-28-2018, 04:47 PM
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In my experience a nitrogen deficiency will always result is in an increase in phosphate concentration. Basically your plants are growing very slowly due to low nitrogen levels and as a result they cannot use all the phosphate provide that the fertilizer is providing. Once you start adding nitrate the phosphate levels should drop.
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