Low GH-KH - The Planted Tank Forum
 
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post #1 of 8 (permalink) Old 06-08-2008, 05:10 PM Thread Starter
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Low GH-KH

I am cycling my new tank so i'm not too worried about my water parameters.
I do however have a very low GH-KH of 0. I have very soft water. PH around 6.2 I am using Aquasoil on top of this so I assume these readings will stay in this range. Should I put something in the water to increse the hardness?I will have many Cardinal tetras and eventually Discus. The tank will be a planted tank. Will Clown Loaches be stressed with these numbers. I have quite a few.
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post #2 of 8 (permalink) Old 06-08-2008, 05:48 PM
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My biggest concern would be the potential for a pH crash. "Modifying" water is a pain, but you might want to consider rasing those to 2 or 3 degrees to buffer the pH a bit.


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post #3 of 8 (permalink) Old 06-08-2008, 06:42 PM Thread Starter
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Quote:
Originally Posted by steven View Post
My biggest concern would be the potential for a pH crash. "Modifying" water is a pain, but you might want to consider rasing those to 2 or 3 degrees to buffer the pH a bit.
Yea, plus I am going to be using CO2. What do you recommend to bring it up?
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post #4 of 8 (permalink) Old 06-08-2008, 06:52 PM
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first of all wow how are u getting water with gh and kh that low! cool beans. I would use tapwater dude, make a mix of the water you currently have and maybe i dunno 25% tap water. Tap water is generally pretty hard although you might not want to make your ph go up especially if you want discus.
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post #5 of 8 (permalink) Old 06-08-2008, 07:17 PM
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If it's not illegal in your area, try collecting some seashells from the beach and place them in your filter. That'll raise your pH and hardness by...a little.

Or another idea is to add calcium carbonate...which I have no idea what it is

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post #6 of 8 (permalink) Old 06-08-2008, 08:15 PM
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Quote:
Originally Posted by markopolo View Post
I would use tapwater dude, make a mix of the water you currently have and maybe i dunno 25% tap water.
I could be mistaken, but I think he was talking about his tap water...


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post #7 of 8 (permalink) Old 06-08-2008, 10:05 PM
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calcium carbonate = baking soda
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post #8 of 8 (permalink) Old 06-08-2008, 10:22 PM
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Quote:
Originally Posted by susankat View Post
calcium carbonate = baking soda
That is incorrect. Baking soda is sodium bicarbonate, and will only raise the KH. Calcium carbonate is a different chemical compound, and raises both KH and GH.

http://www.thekrib.com/Plants/CO2/khgh.html has excellent information regarding water hardness. The following is a direct quote from it:

Quote:
One teaspoon (about 6 grams) of sodium bicarbonate (NaHCO3) per 50
liters of water will increase KH by 4 degrees and will not increase
general hardness. Two teaspoons (about 4 grams) of calcium carbonate
(CaCO3) per 50 liters of water will increase both KH and GH by 4
degrees.
I would use that as a guideline, and do some testing on some sample water to verify you get the expected results. If you do some searching of this forum, you can also find information regarding how to create a known sample to verify the accuracy of your test kits.


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