05-04-2012, 08:43 PM
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I'm a bit confused by the recent posts and would like to sort this out. And, slojko, don't jumpo into this.
First, those numbers in post # 44, are you sure? Olympia is correct, the fish would be showing extreme stress and dying at such high nitrite.
Once the above is resolved, turning to the substrate, this is better changed at once, I have done this myself with 5 of my 5 over the past year. It is much less stressful on fish--and the aquarist--to do it at one go. And I didn't read that link on the process, but a glance over it suggests it is probably the best way, though we can go into this later. This is a task to prepare for, with a tank to house the fish and plants and wood (a 20g is fine for this).
Quantum, it isn't the silica issue so much as the aragonite in that sand, according to the link that slojko posted. But slojko, Q is correct, can you test the GH of the tank water and compare that to the tap water?