Whats too hard for plants? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 02-02-2005, 11:30 PM Thread Starter
 
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Whats too hard for plants?

I had always thought (maybe erroneously) that plants don't do well in hard water, but someone whose opinion I respect is saying that elevated levels of hardness are not a problem. Could someone please clear this up for me?
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post #2 of 5 (permalink) Old 02-02-2005, 11:38 PM
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Depends on the plant. Many of them are quite hardy and adjusts just fine to the elevated pH and hardness levels. There are a handful of them which won't thrive in hard waters though.

Eric


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post #3 of 5 (permalink) Old 02-03-2005, 12:17 AM
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I don't know about high KH, because my kh always at 4, but I am growing some "softwater" plants(a few rotalas including macrandra) much better at GH13 than GH8 through CaCl2 addition.


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post #4 of 5 (permalink) Old 02-03-2005, 05:54 PM
 
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I try to keep my KH in the 4-6 range mainly because then I need less CO2 to get the pH I want.

However I've also found that my plants do better at a higher GH. I see much less or no symptoms of Ca or Mg deficiency than at a lower GH...
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post #5 of 5 (permalink) Old 02-03-2005, 11:34 PM
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KH/pH might be different for about 3 perhaps 4 species. Most, by this I mean 99% of aquatic submersed plants seem to prefer harder water.

Fish might have other opinions.
GH seems to help all the way around.

Which is what we might expect, more nutrients(Mg/Ca).

Regards,
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