How to Lower Nitrite Levels Quickly in Your Aquarium
                                
                                
                                •
                                
                                
                        
                                    
                                    4 min read                                
                            
                                In a healthy aquarium, nitrite levels should always be zero, but sudden spikes can lead to fatal 'brown blood disease' in fish. Learning how to lower nitrite levels quickly is a critical skill for any aquarist, as swift action can prevent a tank-wide tragedy. Nitrite is highly toxic because it prevents fish blood from carrying oxygen, causing them to suffocate internally even with proper aeration.