Latin name: Other names: Pathogen: Symptoms:
Rotten egg smell,
The presence of hydrogen sulphide is characterized by a rotten egg smell. Fish’s respiratory rate decreases, abnormal heart rhythms can be observed. The disease also manifests itself as a loss of movement coordination and paralysis.
The build-up of hydrogen sulphide, a deadly poison, is caused by upsetting biological balance. It appears in the aquarium as a result of bacterial activity (usually in the gravel made of fine sand and organic waste) and in the process of interaction of sulphates and humic acids which are abundant in ‘old’ water. The process is facilitated by a low level of oxygen and large amounts of decomposing organic matter.
How to cure:
Fish moved to fresh water at the stage of the loss of equilibrium recover quickly..
The build-up of hydrogen sulphide can be prevented by removing silt and waste from the gravel. Perform about a 20% water change at least once a week. While setting up the tank, use only large grain sand. Maintain sufficient levels of oxygen in the aquarium.