Bettas need at least a 2.5 gal
- preferably a 5 gal
Keep the temp a stable 76 - 80oF.
Make sure there aren't any rough or sharp objects in the tank that may damage the fins - beware of plastic plants for this reason.
Bettas appreciate something to hide under and rest on top of. A small suction cup soapdish or a clump of Java moss serves this purpose well.
Hikari makes the best betta pellets, IMO
. Supplement the pellets with an occasional shelled, parboiled pea to prevent constipation and bloat.
Bettas absolutely go nuts over bloodworms and brine shrimp - frozen or freeze-dried. They make a great once-a-week treat.