gh/kh levels - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-24-2015, 09:40 PM Thread Starter
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gh/kh levels

I am new to plant tanks. What do all my levels need to be at for plants? If anyone can tell me that would be great. I am using Rodi water. 180 gallon drilled tank 75 gal sump.
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post #2 of 10 (permalink) Old 03-24-2015, 09:51 PM
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General consensus is minimum 2dGH, 2dKH, but every single plant species has its own favorite conditions based on where it's from.
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post #3 of 10 (permalink) Old 03-24-2015, 09:54 PM Thread Starter
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Ok so my kh is around 5 or 6. What should I do to get it down.
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post #4 of 10 (permalink) Old 03-24-2015, 10:13 PM
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[kH should be minimum of 2]... you are fine to have a kH of 5/6. You must be mixing a fair amount of alkaline buffer into your RO mix?
Are you using RO/DI because your tap parameters are poor?
Did you measure your gH, and what are you adding to RO/DI to increase it?
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post #5 of 10 (permalink) Old 03-24-2015, 10:16 PM
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5-6 KH is not a problem at all.

Next WC do less KH component if you want lower KH.

I like whole tank at 3/3. Everything seems to do decently well there.
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post #6 of 10 (permalink) Old 03-24-2015, 10:24 PM
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I think it is also important to be aware of what your fish/shrimp/snails require to survive/thrive. Don't forget about them!
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post #7 of 10 (permalink) Old 03-24-2015, 10:33 PM Thread Starter
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I didn't measure gh. I was out of solution for the test. Yes water is poor. Reason for rodi. I didn't add anything to the ro water before adding to tank.
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post #8 of 10 (permalink) Old 03-24-2015, 11:20 PM
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The normal process with RO/DI is to add back two key constituents that were stripped out during the process: 1) The alkaline buffer as measure by kH 2) The minerals as measured by gH. Both of these values are likely to be zero after RO/DI. You will need to look into purchasing products (like Seachem Alkaline Buffer and Equilibrium) to restore these.

Can you explain how you measured your kH?
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post #9 of 10 (permalink) Old 03-24-2015, 11:34 PM Thread Starter
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With api test kit. Even though I cleaned the tank and every part I used from the salt water. Could residual salt be the reason for high kh?
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post #10 of 10 (permalink) Old 03-24-2015, 11:56 PM
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I believe so, and hope someone else can confirm. It is likely your gH will be high as well. My 180g was also previously salt, and the kH crept up for a few weeks after going FW (even with cleaning prior like you).

This poses an interesting problem going forward. You should expect the remains of the salt water deposits to reduce over time, and the RO/DI you add will have to be mixed to keep up the kH and gH levels. For now it seems you are good, but I would measure the kH and gH for several days in a row to see if the levels have stabilized.
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