- 30 Oct 2008
Antoni Dimitrov said:I have tested the water in the tank, tab water, which I use and the soda water. The results are as follows:
Tank water: KH 7
Tab water: KH 2
Soda water: KH 9
Those numbers aren't nearly as bad as I thought they might be. I was guessing the soda water would be about 12-15 dKH.
Antoni Dimitrov said:I supose this will affect the development of the plants, particularly the hemianthus. Also when I do water changes, this will be a stress for both plants and shrimps.
I don't know if the figures are extreme enough to affect the plants. The fish might suffer from osmotic shock, but that will only happen if you add too much soda water at once, or do a water change without adding any soda to the mix.
I'm still cautious about claiming there's no upper limit of kh for certain plants. Recently my eco-complete stopped leaching carbonates. A bolbitis heudelotii that was struggling suddenly went into overdrive. Beforehand it was dark green and crispy around the edges. Now it's translucent green and unfurling new leaves almost every day. The tropica website claims bolbitis prefers ph of 5-7. While the eco-complete was leaching carbonates, the ph was above 7 at night. Now it's stopped, the ph is below 7 all the time. This could be unrelated, though. I've tweaked everything else in between: CO2, flow, GH, dosing, you name it. So it's far from being a scientific observation.