I found this in the sales and would love some ideas. I put a large apple next to it for scale but its about 1 foot wide at the base. It needs plants (obviously), substrate and ideally some sort of tiny livestock (triops?). I have a mini heater that will go in if required but the only hardscape items I have that fit through the neck are some small slate pieces.
Is it made of plastic? It looks so from the picture.
You could do like somewhatshocked mentioned in number 1. I would put a sponge filter in the middle and surround it with some stem plants so that the bubbles would look like the flask were boiling or something.
I think it would be hard to fit certain hard scapes into the opening, but it could still be managed.
Opae ula could work in there as well with a little lava rock hard scape.
Super cool. You could make one amazing looking wabi kusa in there with just a few cm of water, the beaker shape would keep the humidity up and the plants would probably go nuts. The trimming/shaping would probably be a PITA.