Mebbid
Aquarium Advice Addict
They are very hardy IMHO, just remember they have been in those cups and shipping all over the creation for weeks without water changes or food. It might be hard to find females at Walmart, if I were you I would make sure they are females and not short tail males. Check out this link to be sure of the genders. how to sex bettas . It is so easy to catch the betta bug! I caught it from my cousins poor betta in a tiny bowl with no filter or heater! Needless to say, my first betta was a rescue mission as well . As far as filtration goes, bettas don't like much water flow, so a spounge filter would be the best. An air pump is not needed, as bettas are labyrinth fish, so they breathe air from the surface. A HOB would be a no-no, because of the heavy flow. I have this filter in all of my tanks. Aquarium Sponge Filter | ATI | Bio Filters & Replacement Hydro Sponges
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For males a sponge filter can be a decent idea because of the direct flow potentially shredding their tails. I personally remedied this by using a canister filter with a spray bar attachment. However, females have much smaller tails and there are very few problems if any that arise from having a HOB filter with a female betta tank.
Personally I would go with an Aqua clear filter for a betta tank.