Bettas=YES
Perfect for a lovely betta ;)
Goldfish=no
Goldfish need at least 15-20 gallons per goldfish and they should be living with their own species so you need a 30-40 gallon tank just to hold two goldfish.
When I got my new boy Risteek, all of a sudden Rainbow, a fish who didn't care that hes a betta fish (never flared or built bubblenests) started acting like a betta fish, hehe.
If you are going to get the vase. Make sure you are feedint normally and cleaning the vase normally. And 1 gallon is to small for a betta. They need at least two gallons.
Okay make sure you have aspen or carefresh bedding. A huge cage. Don't get a new friend for your dwarf now please I beg of you. He will more then likly fight.
Dwarfs have a very speacial diet. they cannot have corn, peas, carrots, fruits or any store bought treats. Dwarfs are highly prone to...