KH high=low CO2 - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 05-22-2005, 10:03 PM Thread Starter
 
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KH high=low CO2

Am battling algae in my 75 gal tank. Recently set up Co2 injection system and am doing 50% water changes each Sunday. I understand that the magic number for CO2 is 30ppm but with my water parameters, this seems too high. Are my fish at risk? I am confused.

KH 8.4
GH 50ppm
ph 7.0

Thanks for the great information here

Mary
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post #2 of 6 (permalink) Old 05-22-2005, 10:45 PM
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you are only at 25ppm right now. I wouldn't change it if it is currently working for you.

i have had up to 40ppm and saw no signs of distress in my fish. So, no worries.

Cliff
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post #3 of 6 (permalink) Old 05-22-2005, 11:02 PM
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Assuming your kH 8.4 is degrees while your GH is in ppm, looks like the water is run through a softener. They work by replacing Ca and Mg ions with Sodium ions. Do you?


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post #4 of 6 (permalink) Old 05-23-2005, 10:31 PM Thread Starter
 
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Softener

Yes we run softened water which I have been using in the tank. The GH looks very low-and based on what I have seen it looks like I need to add Epsom salts. The KH though looks unusually high.....

thanks for your help-my understanding of chemistry is the ultimate "limiting factor"
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post #5 of 6 (permalink) Old 05-23-2005, 11:09 PM
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It is my understanding that running water through a conventional softener makes it a bad choice for keeping plants and fish. The balance of salts is somewhat out of whack (sodium instead of Ca/Mg). I would suggest you use water that doesn't run through the softener and then go from there. 8.4 isn't bad at all, my kH is 10, still fine for growing all sorts of plants.


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post #6 of 6 (permalink) Old 05-24-2005, 10:13 PM
 
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Yeah, my Kh is about 9-10 degrees, and my plants do fine. no water softner though.

I think if you switch to potassium chloride for the salt, its a little better for the plants since there's less residual Na ions in the softened water.
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