Betas are very attractive but they don't do well with other fishes especially other male Betas. They're not called Siamese Fighting Fishes for nothing. One Beta in a 10 gallon tank is a good match. Live underwater plants help oxiginate the water and are very attractive. A pump driven aerator/filter is a good idea. Keeping tropical fishes can become as complicated and as costly as you want. Have fun.
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