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Discussion Starter · #1 ·
I am confused. I finally purchased the API KH/GH test kit and checked my aquarium water tonight. I got results of 2-3 dKH (2-3 drops) and 71.6 ppm GH (4 drops). After using this website (http://aqadvisor.com) the goal dH of 11-15 is what I need for the aquarium stock I have. The other sources I found for my fish needs are rated in KH and range from 2-25 KH for the various fish.

I don't know how to decipher this madness. How does dH transfer to dKH or ppm GH or just KH? If my fish thrive in water that has 11-15 dH am I meeting that requirement?
 

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Discussion Starter · #3 ·
Ok I did some more internet digging and found that dH, dKH, and dGH are essentially the same measurement. If this is true then the AquaAdvisor recommendation of 11-15 dH seems really high and in fact is off the scales of what the API test kit records values for. Is this possible?
 

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Discussion Starter · #5 ·
I have a Molly, 10x White Cloud Minnows, 5x Sterbai Corydoras and 2x Otocinlcus in a 29 gallon tank. I have been doing my water changes of about ten gallons every week (or whenever the Nitrates are testing high, whichever is first) using 8 gal RO and 2 gal tap with a water conditioner. This is probably why my aquarium water is looking to be soft. I started using RO when I learned that my tap water had high Nitrates but maybe I need to change the ratio that I am adding to my tank at these water changes.

If it sounds like I don't know what I'm doing it's because I don't. I setup my first aquarium two months ago and launched into the planted tank head first. I'm learning here and those Chemistry courses I took were a long time ago. :icon_wink

Thanks for you help greaser.
 

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So if I am understanding this right than dKH, KH and dH are all the same measurement for carbonate hardness. This is basically what keeps the PH stabilized by acting as a buffer by way of alkalinity. What would cause the PH to change rapidly anyway?

Another question: If GH is the measurement of Magnesium and Calcium than I imagine that the addition of a product like Seachem Flourish would raise GH because it has both Calcium and Magnesium in the solution. This raises my question, what good is GH and why should I care what the measurement is?
 

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Discussion Starter · #9 ·
I totally agree with you about trying to fight water, it doesn't seem to work very well from everything I have read so far. This is the first time I have tested my water for KH or GH so I'm just trying to get a grasp on what my readings mean and if I am meeting the needs of the fish I have. So far everything in my tank has been living (aside from 3 or 4 dead ottos) so I think the water parameters are just fine. The PH remains constant at about 7.4-7.6, it's hard to tell from the API color charts.

I think by doing one less gallon of RO and one additional gallon of tap at water changes might increase the KH and GH and be better though. Thanks for the input midgnighttide
 

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Discussion Starter · #13 ·
So I tested my tap water today and found that it has a PH of 8.4-8.8, dKH of 3, and dH of 9. I knew the tap water PH was high from earlier tests so I have been doing water changes at a ratio of 5:1 RO to tap water to dilute the PH. Now that I have tested for KH and GH I am concerned that the KH is too low to stabilize my PH long term especially when I dilute the tap water with RO water. My main concern is the Strebai Cory that I have because I think they are the best thing in the tank and they need a PH of 7.5 at the high end.

I have done an online search and it seems that a method to raise KH and lower PH does not exist and that I cannot raise KH without affecting PH. Is a KH value of 2 in my tank going to be stable enough?

I am starting to wish I never bought the GH/KH test kit. :hihi:
 

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Discussion Starter · #15 ·
Your honestly going to drive yourself nuts playing with the water
I agree, I probably am putting too much thought into this. If the fish aren't floating yet then what's the problem, right?

High PH tap with low KH got me thinking that I could have a future problem if not handled correctly. I must be doing okay with the RO mix I got going though so I'm going to keep doing it.
 
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