just in case you plan to keep your betta in a vase or something, I’ll give you a little info.
tank size: 2.5 gal+++

cleaning:gravel vacume once a week or just stir it up and let the filter pick it up. do 25% weelk water changes.

feeding: betta bio-gold pellets, frozen or freeze-dried bloodworms and brine shrimp.

tankmates: 2-5 gals, shrimp and snails.
10 gals, a small school of tetras, shrimp, snails or a divided betta tank.

treating diseases:
ICH: small white spots form all over the body or on the fins, this is a parasite that can easily be treated with a med like "ICK away" or simular.
finrot: the fins literally begin to rot, aqurium salt or mela/pimafix.
fungus: the fish has fuzzy white area’s on its body or fins, treat with "ICK AWAY" or another fungus killer.

housing: real or silk plants are good, bettas love to play in them. caves or other hiding/sleeping places, make sure there isn’t anything sharp in the tank, bettas are like little kids, they explore everything 😉
always give your bettas a heater and/or filter, if you dont have a filter do daily small water changes.

lifespan: if taken care of properly, 5+ years, bettas in the wild live 8+ years. but because of how they are treated in stores and in homes(vases, bowls ECT.) they have short lives.
my oldest betta was 8(from a good line of bettas from thailand).

GOOD LUCK!!

http://www.aquabid.com has beautiful bettas.

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Click on any picture to see full size:

Ummm I don’t know if there are black male bettas, but if you the pet store they will have bettas in many colors!