Betta Nitrite Poisoning: The “Brown Blood” Suffocation (Symptoms & Fix)

Betta nitrite poisoning is the cruel second wave of a tank that is still cycling: just as the ammonia danger fades, nitrite rises and suffocates the fish from the inside, which is why a nitrite-poisoned betta keeps gasping at the surface no matter how much you aerate the water. If your betta is gasping with

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