Beta+goldfish=love
Anyway - that's my background for your question - putting a Goldfish in with a Betta fish -
First - it depends on the size of your fishbowl.
If it's one of those tiny fishbowls - NO WAY. Don't even think it.
If it's a BIG Fishbowl - at least 5 gallons or so - AND you have a filter and aeration - that' means you have it hooked to an air pump to run the filter and an air stone to provide extra oxygen to the water - then maybe you can put them together. But not a fancy goldfish - just one of your small comets. Why?
You want a small one - they produce a lot less waste. Remember, Goldfish are notorious for producing a lot of poop. So you need a lot of filtration to clean the water well.
People may say that Male Betta Fish won't get along with others - well, that's not necessarily true. It is true they will not get along with other Male Betta Fish - that's why their more common name is "Siamese Fighting Fish", but when I was a young teen, I had a community tank and a male betta - and had no problems with him.
Oh, I did like to hold a mirror up to the side of the tank every so often so he could see himself and put on a show. They're very beautiful fish when they put on their fighting display!
=================
So - to condense my answer down to a line or two -
Yes you can one male Betta Fish and one SMALL Goldfish together - but only if you have a LARGE - say 5 or 10 gallon Fish bowl - and it has a Filter and air stones.
if you don't have that setup - forget it. don't mix them up or one or both would die on you. You don't want to be cruel to animals, do you?
The best thing you can do is get a 29 gallon set up and have fun with a community tank of tropicals.
Good Luck,
ken
No no no no no no no no NO! The Betta will kill the Goldfish!