Q's about darts in general.

[Mentat]

A vivarium with live plants will require either a drainage layer or a false bottom. When all is said and done you will lose around 6 in. of height to top of substrate. Only way a 20L will work is to stand on an end and then you are left with a pretty small bottom area.

Smaller thumbnails like Imi's will climb all over the place and use 24 in. of height (i.e. an ET 18x18x24 in.) easily. Some of the larger darts (i.e. P. terribilis) and Mantellas will stay close to ground; but if you build ledges. branches, etc. they will use them.

Springtail job is to be part of the clean-up crew; but darts will eat them too and they are required to raise the smaller froglets prior to them accepting newly born wingless D. melanogaster.

A water feature will be used by darts. Builders leave them out because they require additional planning; not because the darts will drown in them.

Recommend you read the dart care articles here, they have lots of useful information .

[ColleenT]

so should the height be about 18 inches on top of the 6 inches of substrate? so 24 inches is the minimum for any dart tank?