04-29-2012, 05:54 PM
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It has no reason to become stagnant. The water under the substrate is pulled by a pump, dumped over the rocks(waterfall) and goes back under the substrate(without touching the substrate). Each day the mist sistem mists more water. When the water level rises to much I just take out some of it or all of it if I feel like it(never really do).
There is nothing living in the water, the frogs do not swim in it or poop or whatever in it.
The only downside is that the water gets a bit brown from the coco humus but it's far from toxic or stale. No smell no nothing, Ph is around 6, not a problem in sight. And it's the same for 99% of the vivariums out there and there are a lot of them to.
The mist sistem does not use the water inside the vivarium to mist, it uses fresh water from the tap and I let it dechlorinate for 24 hours, the 24 hours period also allows for (most)impurities in the water to go down and thus it does not mess with my mist sistem.
That is all I do.