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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. 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...

I'm interested to hear how it works out. It's a neat idea for Nanos, if it works. Are you using regular bottled soda water? I did some reading, and could find very little information on the subject, apart from this. Best of luck.

I've not heard of kH toxicity either. But I've never heard of people dosing Soda Water either. That's why I'm thinking it might be a problem, in this instance. It's the one aspect of the OPs tank that is out of the ordinary. I read wikipedia, sodium bicarbonate is added to neutralise the acidic...

That's kind of what I said. GH just needs to be present. I was thinking more about kH toxicity, than deficiency. Adding soda water - for the CO2, not for the bicarbonates - without monitoring the kH could lead to high levels. I don't know what adding lots of bicarbonates would do to a tank...

Clive, if you read his journal, he's using soda water to supply the CO2. I don't know that much about using soda water, but doesn't some (all?) contain bicarbonates? I'd imagine with certain plants it might be easy to overdo it. I remember reading somewhere that kH is the type of hardness that...

On the tropica website, there's a video showing HC being planted with the rockwool still attached to it, to anchor it. The guy in the video - I think it's Oliver Knott - cuts off the bottom of the grow cube leaving 1cm of rockwool, then divides the plants by cutting them in half again and again.

I think it's Sagittaria platyphylla

I was thinking E. quadricostatus myself. I haven't seen any runners yet. But that might be due to its being pot-planted. EDIT: Aquarium-Gardening website E. quadricostatus photo.

Anyone know what this is?