Snails and Shrimp
Everyone had a goldfish, growing up -- a cloudy tank (or bowl) with no oxygen, no filter, no plants, no character, just a sad little goldfish swimming around in its own poop. Or, maybe you were an avid aquarist and just don't have the time anymore. A small aquascape is the perfect solution for anyone wanting to discover or rediscover the beauty of aquatic nature.
Take it to the next level and create a biosphere built to handle tons of tiny creatures who are not only healthy, but happy. Shrimp, snails and plants are the perfect combination for a low-tech, thriving environment.
Most shrimp require no feeding if settled in a nicely-planted tank. Occasionally, you can supplement their diet, but in the right conditions, they can thrive off of algae other ground material.
Snails, the second part of your "cleanup crew." Snails can eliminate algae and eat detritus, including rotting plant material. They will eat plants too, so don't be surprised to see some definite leaf-removal.
Together, snails and shrimp can make a great community tank that has the ability to sustain itself for a long time.
I can create any type of setting for you.
If you're looking for a "set-it-and-forget-it" type of tank, no problem. A tank with plants only will be fine as-is. You can always add shrimp and snails later if you want to liven the place up.
A planted tank with shrimp and snails is quite simple, but be careful as you might find yourself wanting more!