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You know the one I'm talking about. It's the one where you keep having fish die on you. Somehow you've let tank maintenance fall by the wayside and you come home to dead fish. You try, but you can't save them fast enough. There're too many or just not enough time. Often there are people...

My main tank (roughly 25 gallons with sump) had been battling algae for a while and I realized it was because of a nutrient imbalance. Specifically, there was 0 ppm nitrogen and 0 ppm phosphate. Potassium was probably also 0 but I can't test for it. I bought dry powdered chemicals which worked...

I've never heard of anyone fertilizing nitrogen via gas diffusion. Is that because plants have trouble breaking the diatomic form apart? Or is it simply that pure nitrogen gas is more expensive/cumbersome to use than dissolved potassium nitrate?