Re-readiing my post, it did sound hostile. I was actually mostly confused and frustrated about all of these problems occuring and not being able to figure it out logically. A sulphur smell is most likely coming from some sort of anaerobic bacterial break down that produces hydrogen sulfide. As far as the fungus gnats or any sort of small flies, we don't experience them in dart tanks very often because the darts eat them, and of course we would definitely eschew any sort of pesticide, whether labeled "organic" or not as being possibly harmful to the frogs.

I can think of a couple of things you could try, one being aerating your false bottom with an aquarium bubbler, which would help oxygenate the water and kill off any anaerobes that could be causing this stink. Usually the water in our false bottoms is circulated over falls by a pump and aerated in that manner, and the false bottoms are designed specifically for water features.

Have you seen any particular plant damage that appears to be insect related? Root or stem rot? Do you ever plan to introduce amphibians or other animals to this tank in the future, or is it a straight plant terrarium? What plants are you growing in it? I'll try to review your previous posts specifically, since I can't always remember who has posted what, and make an effort to give some real help instead of a hostile sounding response, that I apologize for, by the way. I just thought, "This guy is having one difficulty after another, and that's just not normal unless something else is going on," so maybe we need to go back to the beginning in order to figure it out. I don't want to give this forum a bad name by being a crab or appearing snotty when I can't come up with a logical answer. I'm only an interested guest here myself, and my own experience with terrarium plants and vivarums is fairly good, but still limited, not by any means an ultimate authority.
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Patty
Pahsimeroi, Idaho

4 D. auratus blue
5 D. galactonotus pumpkin orange splash back
5 D. imitator
6 D. leucomelas
4 D. pumilio Bastimentos
4 D. fantasticus
4 P. terribilis
4 D. reticulatus
4 D. castaneoticus
2 D. azureus
4 P vittatus

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