Hi my water still have ammonia, long story short my water para was all good until I had a nitrate reactor and then 2 week later I see my fish health is looking not good so I test my water and I have ammonia in my water and nitrate. so I took out the nitrate reactor and did 50% water change 2 days later I test again and my water still have 1ppm of ammonia and 10-20ppm of nitrate. I tested the water and I have 0ppm of nitrite. I don't understand wants going on in my water. I keep doing water changes and my ammonia is not making any changes nor my nitrate always stay at 10-20ppm even when I test my water the next day. do u think I should clean my canister and my hob? I just cleaned the canister and hob 3 month ago. I only have 1 fish in the tank. It is 125g tank