Tetra Test -NH3 / NH4 (amoniaco) 14216

The first stage in the decomposition of organic nitrogenous substances such as fish waste, uneaten food and plant remains generates toxic ammonia (NH3) and non-toxic ammonium (NH4+).

Both ammonium and ammonia are balanced in terms of pH values.

The rule is that a high pH value (>8.5) means a greater level of toxic ammonia, whereas a low pH value (
To avoid damaging the fish, steps need to be taken to ensure that, on the one hand, the pH value is appropriate and, on the other hand, that the concentration of ammonia is generally kept as low as possible.

The ammonia concentration in a biologically sound aquarium is so low that it is barely detectable.