Rotala macrandra v. 'narrow leaf' aka Rotala magenta - Page 2 - Plant Physiology & Emersed Culture - Aquatic Plant Central

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Old 02-03-2005, 04:20 PM   #11 (permalink)
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If you call your water company, they'll tell you the ratio of calcium to magnesium. In my case, it's about 3 to 1.
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Old 02-04-2005, 06:49 AM   #12 (permalink)
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Quote:
Originally Posted by shalu
That's what I was thinking as well. Separate accurate measurements of Ca/Mg require expensive kits, so I am not sure what exactly the values are in my tap.
Hi shalu

Surely you already have a GH kit, so the only one you would need to add is a $6 Ca test kit. You can get Mg concentration by testing for GH and Ca, then calculating the Mg.

Water hardness, magnesium and calcium article

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Old 02-04-2005, 11:09 AM   #13 (permalink)
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Quote:
Originally Posted by Edward
Hi shalu

Surely you already have a GH kit, so the only one you would need to add is a $6 Ca test kit. You can get Mg concentration by testing for GH and Ca, then calculating the Mg.

Water hardness, magnesium and calcium article

Edward
The only problem is, my $6 Ca test kit(AP one I think) was for SALT water, and I know for sure its reading is way off for freshwater, because I did an experiment by adding NaCl into the water to mimic salt water to some degree, and Ca reading is very different. In addition, it is in increments of 20 ppm. So combined resolution of GH(1 deg) and Ca makes accurate determination almost impossible. Or can you suggest a good, cheap Ca test kit for freshwater?
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Old 02-05-2005, 06:27 AM   #14 (permalink)
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Hi Shalu

Look at the article again. There is a description on a Hagen test kit. Most of us use it with great success. The increments of 10 ppm work just fine and we never had a bad kit.

Edward
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Old 06-10-2005, 09:42 PM   #15 (permalink)
 
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Rotala macrandra var 'Narrow Leaf' this is?
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Old 06-11-2005, 07:02 AM   #16 (permalink)
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That looks like it to me.

I agree with Carlos' assessment that it prefers softer water. Some Ca is required, but I've found most Rotalas, this one included, do best in GH <6

The "magenta" I've grown does get a somewhat more orange hue than the normal macrandra I've grown and seen. It's a very pretty looking plant when it's doing well.
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