7cm - 12.7cm
6.8 - 7.5
Ideally keep it in a heavily planted tank with plenty of floating vegetation, which will allow it to exhibit its natural behaviour. In a brightly lit or sparsely decorated tank, it tends to spend a lot of its time hidden away. It can be kept in unplanted tanks, but at the very least provide lots of hiding places and refuges. Make sure the cover is very tightly fitting as it can and will escape if given the opportunity.
Temperature: 72-79°F (22-26°C)
pH: Very adaptable and unfussy regarding water chemistry. Anywhere in the range 5.5-7.5 is ok.