Originally Posted by BettaNubRandyLove
Well if its a guppy. Its gonna need some friends when its older. good rule is 1 male. Needs 2-3 females.
Thats the rule of thumb, if its a platy, molly, guppy or any live bearer.
However swordtails are the only species that are happy to break that rule. They can be paired off. The male doesn't show much aggression and doesn't chase the female as much as other livebearers do. If you don't want other babies and it turns out be be a sword, then you can get another female sword they will have a blast together.
( currently own a pair of swords, and a breeder of platies, thinking of breeding mollies and betta's down the road)