Healthy aquariums with conditions close to nature The right water values depend on the water you start with, the fish stock and the existing plants. Even if the water looks clear it can be contaminated. With bad values diseases or algae can appear in the aquarium. To maintain a healthy aquarium with conditions close to nature regular checks and adaptions of the water values are important. The JBL test strips serve here as a general guidance. The following parameters can be determined in a quick test: disinfectants in the tap water: chlorine test acidity of the water: pH test from 6.4 up to 9.0 stability of the water: KH test from 0 up to 20 °dKH general hardness of the water: GH test from 21 °dKH toxic nitrogen compounds: NO2 from 0 up to 10 mg/l cause of algae: NO3 from 0 up to 250 mg/l asy to use Dip the test strip into the aquarium water and move it for 2-3 seconds. Take test strip out of the water and hold it horizontally to allow the water to drain off. Compare the values of the test strip after
