Help my nitrate is at 80ppm. I did a water change about 60 precent, and I check the water again is still at 80ppm, so I did a 70 percent water change again and is still at 80ppm. What do I do? Should I buy denitrate?
Ammonia: 0ppm
Nitrite: 5.0ppm
Nitrate: 80 ppm