I placed the juvenile bettas with 8 swortdtails just about their size, for them to copy the eating behavior of the swordtails.. Now one of the bettas can't stop eating every processed food still in the tank bottom! I hope his digestive system won't get sick! His/her tummy is so round and bulging already, but he/she still keeps on eating!
There are only 2 fry in a heavily planted 8 gallon container outside. lol. I think that's enough room for them. And for the next batch of fry, i bought some very large plastic basins. About 2.5 feet in diameter and more than 1.5 ft deep. The second spawn i have is 2 weeks old. I'll put them in the basins when they are about a month old.