ok, so My boyfriend just randomley got my this cute little betta home, but its un-filtered with no heater (I can add a heater if nessisary) so idon't wanna get a betta... Are there any snails that would be happy in here?
Get a heater and a sponge filter. You don't need any other filter. A sponge filter should be sufficient. The only snails I'd put with bettas are nerites or MTS. Bettas tend to harass snails especially when they expose their soft tissues.