A great problem in our hobby will suit Chytrid (Batrachochytrium dendrobatidis), a mushroom, this one creates our quite poisonous animals itself to have fallen ill.
Often is it is Chytrid suspected (or also claimed) at an unexpected death without the corresponding animal being examined. Such an examination at Exomed (Dr. Mutschmann -- the expert in this field) costs about 40-50 euros per animal.
This price deters particularly since one often already gets a new animal for the money. And but the guilty person is found, Chytrid.
There are numerous other illnesses be able to these get our little friends. Bacteria, viruses, other mushrooms or parasites can be the trigger and also draw the death after themselves.
Is differently than often claimed, Chytrid is but it fatally, rather was not proved in different countries (e.g. Australia, Germany, Canada, means and South America and the USA) in nature and also in most Terrarien generally. It also is held responsible for dying out worldwide suddenly of all sorts of AmphibienSpeciesen. Since there, however, still are animals in free nature, it cannot kill 100% of the animals.
Everybody almost has him probable sit without the he impaired his animals into his Terrarien. Who so claimed is his Terrarienanlage chytridfrei guaranteed takes its mouth a little fully since an attack cannot be proved at the living animal (yet)?
Chytrid then usually comes to the outbreak if one prepares his animals stress e.g. by one catching it for the sale. The transport, the new microclimate then do her left. The proud buyer then has a "condemned person" and believes himself to have brought in the mushroom with the new animal although he has it under circumstances already for years.
One gets the mushroom if one inserts a dry season he does not have any good chance of survival possibly under control at higher temperatures and dryness there. This, however, does not therefore all foresight after never apply to its spurs, loose one becomes him.

 

An ill frog should be separated basically not to infect other frogs also and to be better observeable.