Why would KH go down? - The Planted Tank Forum
 
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post #1 of 5 (permalink) Old 12-13-2004, 07:07 AM Thread Starter
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Why would KH go down?

ok, I'm a little confused --

When I set my tank up last week, I had a KH of about 5-6, with a pH of about 7.2-7.4. Today, after a week of pressurized CO2 injection controlled by a Milwaukee controller I'm getting a reading of 6.8 pH on the controller LCD and likewise a 6.8 pH reading from my Aquarium Pharmaceuticals test kit. So far, so good. (My tests kits use drops)

Then I went to test my KH with my Aquarium Pharmaceuticals KH kit (same one from earlier in week), and now my KH is reading is down to a 3.0 - low 4. Tested twice, same results. I also tested a sample of tap water: it was still a KH of 5 - 6 (just like when I first filled the tank).

What gives? I though KH was suppose to remain constant. No rocks, wood, or modifiers in my tank/filter. Just 100% Flourite. Some Water Sprite and Val and a few Angels.

At 6.8ph and 3KH I'm still providing a "good" level of CO2 (about 14ppm). BUT I was really hoping for the 20-25ppm of CO2 a KH of 5 would have provided me at 6.8ph. Any thoughts? Should I go lower to a pH of 6.6 or 6.7 (assuming KH stays at 3)? Is that dangerous? Not sure how folks usually go.

thanks as always
steve
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post #2 of 5 (permalink) Old 12-13-2004, 07:19 AM Thread Starter
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Update

After searching a little on here, I am suspecting it might be my Flourite.

I know, I know Flourite is not suppose to change water parameters like KH, but read this read, particularly the conclusions Rolo came to at the end:

https://www.plantedtank.net/forums/sh...urite+hardness

I'm due for a water change soon, I'll see if that helps.
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post #3 of 5 (permalink) Old 12-13-2004, 03:16 PM
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If the kh drops below 3, you can expect a pH crash, which could kill off lots of fish. I got lucky and didn't lose any. But, upon testing my pH one day, I noticed it at the lowest reading (6.0), so it could have been lower. Checking my kh, I found it was down less than 1 drop of reagent. I eventually tracked my kh (and gh!) killer to "toxic" driftwood. So, if the kh is continually dropping, either find the source or don't miss any weekly water changes.

Brian.

46g bf, XP3 w/ vertical spray bar, CO2 w/ SMS122 & diffuser,100% Flourite, 96w+55w cf AHS, AGA Member
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post #4 of 5 (permalink) Old 12-13-2004, 07:27 PM Thread Starter
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sounds like I should do a water change tonight, since that was recommended for addressing possible Flourite problems
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post #5 of 5 (permalink) Old 12-13-2004, 07:38 PM
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I read some where that the bacteria in the ammonia, nitrite, nitrate cycle will release acid as a by product. That could be the source of your KH drop.
Ive had a bare bottom tank that had dropping KH issues as well. The only cause of the drop would be the bacteria.

Ray

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Tank Information: 100 gallon TruVu, white play sand, Eheim 2028pro2 and 2026pro2, 2X96W PC 6700K and 2X55W PC GE 9325K, Pressurized CO2, Eheim autofeeder
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