yeh buy an adult female in the shop, obtaining fry is risky as they are much weaker. i have three i do recomend you buy more they are not than agressive and an 80 litre is more than capable for anothe bn
gouramis are also cool if your thinking of getting some i recomend a pair of dwarf gouramis but i found its hard to find females in shops but concider a male and a female