Thought someone might be interested to see how I have my critter keepers set up for darts. The one on the right houses my leucs (who are almost ready to go to a real viv), the middle one houses 4 vents, and the extreme left one houses 3 vents.
I don't have a real viv set up for them yet. They're all juvies save one, so I feel comfortable leaving them in there as long as necessary. I like the critter keepers better for raising juvies and quarantine, because IMHO the frogs are easier to observe due to the clarity of the plastic. Also, the lids are much more secure than your average shoebox. The lid locks tightly to the sides, and the hatch locks by sliding forwards under a lip. Even tiny escape artists like vents can't squeeze out. The vents have been in there for almost 2 months (since NWFF), and the leucs have been in theirs since March with absolutely no problems.