Target ranges for Magnesium, Calcium, and phosphates? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 12-06-2011, 07:44 PM Thread Starter
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Target ranges for Magnesium, Calcium, and phosphates?

Hi people, what would be the ideal ranges (in p.p.m.) for Magnesium, Calcium, and Phosphates in a heavily planted tank with a decent amount of CO2?
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post #2 of 6 (permalink) Old 12-06-2011, 08:38 PM
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P 1-2ppm target
CA/MG its a ratio but seen it debated

Texas water is like liquid rock, (San Antonio)... u adding back to RO/DI water?
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post #3 of 6 (permalink) Old 12-06-2011, 09:02 PM Thread Starter
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P 1-2ppm target
CA/MG its a ratio but seen it debated

Texas water is like liquid rock, (San Antonio)... u adding back to RO/DI water?
Yeah, tell me about...the PH stands at 8.0 ppm if not higher.I use 4/5 part RO & 1/5 tap water for the weekly partial water changes so that's why I don't add any Ca/Mg back to it.

Two months ago, I attended a seminar given by the Red Sea people (the brand) about their new line of products such as the new super accurate tests & supplements for reef aquariums. I was very impressed by their new products especially the new tests. For example, the accuracy for the NO3 test is 0.125 ppm and for PO4 0.02 ppm. After the seminar, I asked one of their representatives if I could use the NO3 & PO4 tests for freshwater & he replied although these tests were especially designed for marine aquariums, they're more accurate than many other test brands for use in freshwater aquariums. So I went a head and purchased their NO3 & PO4 tests. I'm seriously thinking about buying their Mg & Ca tests as well but first I need to know what are ideal ranges for those two elements and also to find out if my aquarium is getting enough Ca/Mg JUST from adding 1/5 parts tap water.
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post #4 of 6 (permalink) Old 12-07-2011, 01:58 AM
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P 1-3ppm (depending on plants, .5-1ppm is used very often)
Mg 7-10ppm
Ca 30ppm

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post #5 of 6 (permalink) Old 12-07-2011, 02:36 AM Thread Starter
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P 1-3ppm (depending on plants, .5-1ppm is used very often)
Mg 7-10ppm
Ca 30ppm
Thanks happi, those were the numbers I was looking for
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post #6 of 6 (permalink) Old 12-07-2011, 06:05 AM
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I've run from 0.2ppm PO4 to about 5ppm or so these days.
Mg, from near 1ppm to zero, up to 25ppm.
Ca from 10ppm to perhaps 80-90ppm.

You have plenty of Ca in 99% of tap water sources unless they use a softener with salt exchange, but Mg might run low/limiting in some tap water sources.

So PO4 and Mg would be the things to measure.

Also, check their no#'s and claims by making some reference standards and not listen to the sales people from Red Sea. Simply use a dosing cal to make the standard references for say 1 liter batches.

Then see if the method and the test kits match those KNOWN reference samples.




Regards,
Tom Barr
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