mrplaty
Fishaholic
when you breed bettas and the males start to show aggression how big do the jars that you put them in have to be 



I am using Pickle jars, and canning jars I had left over from Oct. when I made applesauce..You can get canning jars really cheap at Walmart in housewares, and they come with lids - about 10 or 15 to a pack. About as big as those plastic Hexagon tanks they sell at your local petstore, sept they are glass.