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If you decide to go bare bottom make sure the bottom of the tank is a dark color. If it's sitting on a white table or on an open bottomed stand over a light colored rug then you'll want to either paint the bottom dark (black or brown is good) or tape dark tagboard to the bottom (that works good for backgrounds too btw). If the bottom is too light it can cause fish to lose color and feel less secure.
I've used gravel with all my bettas and no problems...you just have to make sure it's too big for them to swallow, smooth, and kept clean. However there's nothing wrong with a bare bottom and it definately is a lot easier to keep clean.
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