Neocaridina shrimp like the orange sakura don't have many requirements when it comes to their tank. This makes them a great choice for beginners just getting into shrimp keeping or anyone looking to set up a simple aquarium. A 5 gallon aquarium should be enough for a sizeable colony.
Add plenty of decoration in the form of plants, shrimp flats and anything else that provides some cover. Leaf litter like Indian almond leaves or alder cones are also a good addition. They help imitate the natural habitat, offer extra hiding places and release tannins and humins which are beneficial to the health of your shrimp.
If your tank is shrimp-only and heavily planted you might not even need a filter for your orange sakura shrimp. If this isn't the case or you don't feel experienced enough to experiment with this yet be sure to add at least some filtration. A small air-powered sponge filter should be enough to establish a stable cycle without sucking up and possibly damaging baby shrimp.
Orange sakura shrimp aren't too fussy about water quality. Make sure the aquarium is always cycled and free of any ammonia and nitrites. Keep the nitrates low by doing weekly water changes and perform regular tests with a liquid test kit to ensure the water values are where they're supposed to be.
A very important factor in keeping any dwarf shrimp species is stability: sudden fluctuations can be fatal, so always be careful. Match new water to the old when doing water changes, both in water values and temperature. If the room your aquarium is in is prone to temperature fluctuations be sure to use a heater to keep things stable.