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I don't have an answer for you, but I do have a few thoughts/questions.
1) have you tested the water itself for the usual tank (bioload produced)pollutants?
2) does anyone know if fiberglass leaches chemicals into the water -type of rocks too?
3) does the bowl sit in a sunny spot that would allow signficant temperature swings through the day?
4) is there a lot of surface are allowing for exchange? Or is it pretty narrow/tall?
5) Of the 16gal, how much of it is actually water - related to 3 and 4.
I keep a 50 gallon container with goldfish and have thought about adding guppies to further ensure that it's not a mosquito pool.
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