Out of 9 tanks, I have one just like this. The water always smells awful. It isn't planted, but does have live plants: Java fern, najas grass, sunset hygro, and hornwort. It only has 3 occupants: A male betta and 2 inch long baby BNs. All the water params are in line (it has been cycled for 2 years)
However, it is one of two that have gravel substrate. I am wondering if this has anything to do with it. But, the other tank does not smell at all. hmmm....
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