Kh confusion. Where should this be?? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 10-19-2012, 06:50 PM Thread Starter
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Kh confusion. Where should this be??

Tank- 11kh
Ro/di- 1kh
Tap- 18kh

I'm just confused on where my kh level should be and why it seems so high in my tank. From what I've read ideally you want it somewhere between 3-5 degrees. I use prettying a mix of 70-30 mix of ro/di to tap water and my tds in the tank, if it matters is 237. I'm still not educated on the whole water chemistry stuff yet but how do I get this adjusted down to the recommended level of between 3-5 degrees. I just planted my tank with Erio parkeri, glosso, giant hairgrass, blyxa and araguaia. Fish include 3 apisto's and a school of rasboras. Also I run pressurized co2 and Ei dose.

Any help would be greatly appreciated!!
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post #2 of 7 (permalink) Old 10-19-2012, 06:59 PM
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Really high KH can be harmful to some fish and hard for some plants to adjust to. Low KH isn't a problem for almost all plants, and only a possible problem for fish that need really hard water - some Cichlids. Almost all of the plants and fish we use will do ok in water with around 2 or 3 dKH to perhaps 5 or 6 dKH. Some people have no problems with as low as 1 dKH or a bit lower. But, no fish handle sudden big changes in KH well. So, avoiding big KH changes is probably the most important thing. That makes adding large amounts of baking soda after water changes, to adjust the KH, a questionable thing.

Hoppy
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post #3 of 7 (permalink) Old 10-19-2012, 07:43 PM Thread Starter
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So what is the best solution? Do I just leave it alone or cut my water mix ratio
back? Will may plants be ok with such a high kh? I guess I just don't understand why it's so high to begin with.
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post #4 of 7 (permalink) Old 10-20-2012, 12:09 AM
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I would test a few mixes of RO (or RO/DI) plus tap.

Try:
10% tap + 90% RO
25% tap + 75% RO
maybe somewhere in between?

KH is simple math, so
25% tap @ 18dKH
75% RO @ 0dKH
ought to result in water with 4.5 dKH.

10% tap + 90%RO = 1.8dKH

What is the GH like in the tap water? If it is already sort of low, then blending it with RO might drop it lower than you want. If this happens add some GH booster (not much!) to bring it back up.

If the fish you want to keep come from black water rivers then make a mix of waters that you think is pretty close, both GH and KH, then run it through peat moss. This will add organic acids that replicate the black water chemistry that is common in many tropical rivers.
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post #5 of 7 (permalink) Old 10-20-2012, 01:05 AM Thread Starter
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Where can I buy peat moss? I was thinking of just putting some in my storage ro/di bin. How much would I need?
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post #6 of 7 (permalink) Old 10-21-2012, 12:35 AM Thread Starter
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???
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post #7 of 7 (permalink) Old 10-21-2012, 07:21 AM
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you can get peat moss at Home Depot in the summers at least or any garden supply store. I just searched walmart's site and it appears they carry the smaller containers of it year round.
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