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There is no such thing as a natural environment for a Betta splendens that could ever fit into a 1 or even a 10 gallon tank. Bettas are found in "rice paddies" and similar locations. Although the water may not be very deep, it may well extend for hundreds of yards in all directions. Such an environment is simply not possible in a home aquarium. The best we can hope to do is to recreate a similar planting scheme and give the guy a bit of room to swim in. Since wild bettas, not the kind we keep in our tanks, live in slow moving streams and ponds, you might get away with using typical South East Asian plantings over a muddy or soil type substrate in a good sized tank that has good filter flow. It will never match a wild environment but may come close enough to call it a biotope.