Ammonia
1. Fill up a sample of water
2. Add 8 drops of ammonia 1
3. Add 8 drops of ammonia 2
4. Swirl the sample
5. Wait 5 min
6. Check the color of the water

Nitrate
1. Fill up a sample of water
2. Add 10 drops of Nitrate 1
2. Swirl the sample
3. Shake the bottle for Nitrate 2 for 30 sec
4. Add 10 drops of Nitrate 2
5. Swirl the sample for one minute
6. Wait 5 min
7. Check the color of the water

If the levels for ammonia and nitrate are not stable then the fish can die.