someone will chime in with specific species that don't require a lot of care. hard to care plants won't thrive in sand because it's not the ideal substrate. but some hard to kill plants will survive in most conditions. your open areas are a good idea, i'd suggest a rock or piece of driftwood so it doesn't look blah.
Blue rams would be my suggestion. you could have a couple in a 20L and do just fine. I would't advise keeping the tank in direct sunlight, you'll be cleaning algae off the glass every few days.
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