okay, so here's the setup i'm gonna use:
start out with one, then three, then five or six of these jars
topsoil for substrate with a micro-pot buried in the soil, it's opening will create a hidey-cave for the betta
a large pothos rooted in the bottom, and extending to the surface
a lucky bamboo, planted high enough that the top section will prop the lid open just an inch to let air flow, but still prevent jumping (pretty AND functional!)
a garden of hornwort and wisteria all around the bottom of the jar
and last but not least, one male betta in each, either delta, halfmoon or veiltails, in as much of a color variety as i can find.
all this will be laid out on a long self, dresser or coffee table and secured in place with lines of silicone on the shelf surface to provide traction and prevent our son or her cat from pulling or knocking them over.