need help with mystery kH drop in new tank. - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 02-15-2006, 03:03 PM Thread Starter
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need help with mystery kH drop in new tank.

OK, this past weekend I made the switch from my 55 to the 125, and after 3 days my kH dropped from its usual 7 degrees to 4.
At first I thought the test kit might have gone bad, so I tested the tap water (itís usual 7), then I re-tested the tank water (still 4).

So I this has to be a result of the tank transition (no peat added). I thoroughly rinsed 6 new bags of Fluorite, and placed this down in the empty tank.
After moving the plants, and fish from my current tank, I then started putting the aged fluorite into a fine mesh bag (5 gallon paint strainer) to transport and empty into the new tank. This method let out quite a bit of very dark brown water. After all the aged substrate was in, I added about 2Ē of water, and then planted (no fert tabs or spikes). Filled the rest of the tank, primed the filters, let the temp stabilize, and added the fish.
Now here is a bit that might have had some effect, but Iím not sure how.
I upped the CO2 for the new tank from 2 BPS to about 4 BPS. In the middle of the night my wife noticed that all the fish were gasping at the surface. I added an air pump, and when I went to shut off the CO2, I noticed that it was bubbling at more like 8 BPS! I lost 1 rosey barb, but thankfully everyone else seems to have pulled though.

Anyway, Iím still wondering what would cause a kH drop like this. I was expecting a pH shift from digging through the substrate, but not a change in hardness.

Iím hoping someone can enlighten me as to what happened.


Thanks
Walter

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post #2 of 3 (permalink) Old 02-15-2006, 05:50 PM
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I think it was your CO2 overdose, it may not have anything to do with your move...

Lets see if I have this right...
carbonate harness= buffering capacity= buffers are weak bases, right?
CO2 = lower Ph= acidic water

Your KH (weak base) will react with and nuetralize the acid to keep Ph stable. So I think you used up some of your bases (kH) neutralizing the acids when your CO2 got up so high...

Does that sound right?
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post #3 of 3 (permalink) Old 02-16-2006, 12:05 PM Thread Starter
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Thanks Turbo, makes total sense... to me.

Walter

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