Originally Posted by Hadouken441
Haha this is funny. Since when did all these rules happen? My girlfriend has very expensive goldish and in the tank it also has 2 bettas. None of them ever fight and there has never been a problem with "strong current" or anything like that. Goldfish are gorillas and can handle any kind of water. Her tank temp is at 77 and thats fine for both. The bettas actually swim with the goldfish and eat with them and nothing bad ever happens. The tank has been set up for a long time too. Theres always a way to make any fish work with each other if you do things right. And for filtration, well her tank is as heavily planted as mine are. So if you can make it work make it work. Only problem I see is that your tank is small for the goldfish not the betta. A normal fancy goldfish can get up to 10 inches.
Any good aquarium book written, will tell you that goldfish and Bettas do not share same water requirements nor do they share same diets.
Two very different species with very different needs. Your assertion that "there is always a way to make any fish work with each other" is patently false,, and is directly responsible for more fish deaths than lives lost in some wars.