Regardless of which plants or plant types you choose, I would suggest you focus on two significant (IMHO) points...
- Health of growing medium.
To explain in more detail...
You note you intend to maintain a room temperature with low humidity. Let me assume 21°C / 70°F and RH less than 50%.
Whichever plants you choose, you will need to create a microclimate suitable for each genus and species, for your selected plants to grow in reasonable and sustainable health.
To make it even possible for you to create a suitable microclimate, I strongly recommend selecting plants that all require the same or similar conditions. Otherwise, attempting to grow (for example) ferns and succulents together, will only make the establishment and maintenance periods more difficult to master.
Tropical rainforest plants generally need lower light levels and high humidity. How might this be achieved? Maybe use a spray bottle every day to apply surface moisture to the leaves of the plants, spray when you wake up in the morning and after your evening meal? Maybe (also) apply small amounts of water daily, to ensure the medium is always moist and never dries out?
Succulents generally need light and heat during the day and cold during the night, with periods of dry soil followed by periods of wet soil. How might this be achieved? Maybe a long soaking of the entire unit once a week in the laundry sink? Maybe three short soakings a week in-situ / without removing the unit from its hanging position?
2. Health of Growing Medium
Whichever plants you choose, you will need to create a healthy growing medium for the plants to grow in reasonable and sustainable health.
I strongly recommend the use of a premium quality “soil/plant” inoculant that will create a thriving “soil/plant” microbiology. With a healthy growing medium, whichever plants you choose will be so much healthier and therefore far more resilient.
If you are a keen gardener you’re likely to already operate a domestic worm farm. Use the vermicaste produced by the worms in the farm as a “soil/plant” inoculant, apply to the growing media (in your case sphagnum moss) at least once a month during your selected plants growing season.
If you don’t have a worm farm, there are commercially available products that are a suitable replacement. In Australia I recommend a Neutrog branded product called “GoGo Juice”. This is an ideal substitute to vermicaste and produces a thriving “soil/plant” microbiology, even in an environment as small as the hang.oasi.home planter. Apply to the growing media (in your case sphagnum moss) at least once a month during your selected plants growing season.
This is somewhat a personal choice for you depending on what plants you find aesthetically pleasing, your level of experience and enthusiasm and how much time you are willing to spend on the ongoing care of your mini garden.
If you’re starting out, personally I’d recommend:
- clumping types of ferns (many suitable genus and species to choose from);
- an Epipremnum sp. (for trailing growth);
- a small leaf clumping variety of Philodendron sp. (for striking appearance);
- maybe even a small variety of Spathiphyllum sp.