Rising KH & GH - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 01-25-2005, 11:14 PM Thread Starter
 
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Question Rising KH & GH

My KH & GH have been slowly creeping up over the last five days,
( KH 6.72 to 10.8, GH 7.5 to 13.44) and I have yet to figure that one out. (Tap is KH 7.28, GH 11.2) I first thought my test kit was at fault but a new kit gives the same results
The driftwood leaching tannin would lower KH would it not?
Also Eco-Complete ( planted aquarium substrate ) is not supposed to increase KH & GH.
The only other thing in the tank is slate, which I tested by soaking in tap water for two days. KH & GH actually went down a bit.
PH as been stable at 6.6-6.8 and fish are doing great, CO2 production has slowed to about half of what it was last week and, the wisteria has grown by about 2-3 inches.
Only other major changes, is a possible algae bloom ( another tread under algae ) and the addition of five Ottos and two female Bettas

Tank Stats: 50Gallon, 130W Aqualight, DIY CO2, NO3 5ppm ( last night before adding 1/4 tsp KNO3 ), PO4 .25-.5, PH 6.4, KH 10.8, GH 13.4, Iron .5 ( last night before 25% water change ).
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post #2 of 7 (permalink) Old 01-26-2005, 01:39 AM
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Quote:
Originally Posted by andyg
My KH & GH have been slowly creeping up over the last five days,
( KH 6.72 to 10.8, GH 7.5 to 13.44) and I have yet to figure that one out. (Tap is KH 7.28, GH 11.2) I first thought my test kit was at fault but a new kit gives the same results.
My first thought was Wow - how is he measuring kH and GH to two decimal places?? Inquiring chemists want to know - are you actually titrating with a buret?

Your problem might be evaporation - that will increase all your minerals if they are not being used by plants. But over 5 days - that is pretty fast! Is it an open-top discus (84 degree) tank? Otherwise I'm at a loss.

Kevin

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72g bowfront planted, CO2, 4x - T5HO, Eheim 2213 and 2217, 2 angels, pristella tetras, blue tetras, betta, albino bristlenose pleco, albino cories. Sword, vals, hygros, ludwigias, java moss and fern, anubias

2g Mac-quarium. Clown gravel, fluorescent plastic plants, and 2 guppies.
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post #3 of 7 (permalink) Old 01-26-2005, 01:44 AM
 
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Also Eco-Complete ( planted aquarium substrate ) is not supposed to increase KH & GH.
We have found this to be untrue as of late. It is possible that some batches buffer the water a bit but does not last long. I have not experienced it but many have it seems.
Keep an eye on it and please report back... Im curious if it stays that way.
Thanks.
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post #4 of 7 (permalink) Old 01-26-2005, 12:46 PM Thread Starter
 
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Originally Posted by KevinC
My first thought was Wow - how is he measuring kH and GH to two decimal places?? Inquiring chemists want to know - are you actually titrating with a buret?

Your problem might be evaporation - that will increase all your minerals if they are not being used by plants. But over 5 days - that is pretty fast! Is it an open-top discus (84 degree) tank? Otherwise I'm at a loss.

Kevin
LOL Kevin. I just transfered the numbers from the calculator.
KH 130 * .056 = 7.28. I guess I could round of the numbers.
I also thought evaporation, but this tank is at 74 with a glass top. I've also not noticed any decrease in the water level.

Buck; Thanks for the input, I retest tonight and post back if things change.
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post #5 of 7 (permalink) Old 01-26-2005, 03:54 PM
 
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I agree with Buck...it seems that there's a 50/50 chance that eco-complete will add a little buffering, until water changes bring it back down to 'tap water' levels.

Leeching driftwood should lower pH, but I don't think you'll see the Kh drop...at least not a noticable amount in a short period...same with the pH really. Its something you'd see over the course of many weeks/months.
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post #6 of 7 (permalink) Old 01-26-2005, 04:21 PM Thread Starter
 
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Thanks Malkore.
Tested KH & GH this am. KH down 1+ degree no change in GH. PH up to 7.0.
Finally got my CO2 out of the red zone.(27ppm)

Now the next question, could this increase the levels of calcium, carbonate, ect, and help causing the GW I'm experiencing at the moment?

This am before adding ferts, NO3 5ppm, PO4 .5ppm.
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post #7 of 7 (permalink) Old 01-31-2005, 05:27 PM Thread Starter
 
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Five days since the last test;
So my KH is no longer rising but instead coming down slowly, GH remains steady.
This am, KH 8.4dKH, GH 13.4 dGH, PH 7.
Did a 25% water change on the 28th with 50/50 tap water & RO.
I suspect it does'nt account for the drop in KH as Gh has not changed
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