1. Head difference: The male ruby fish has a slightly raised head, thick lips, and a slightly protruding mouth. The female ruby fish has a relatively smooth head, thin lips and a pointed mouth, but does not protrude outward.
2. Difference of dorsal fin: The dorsal fin of male ruby fish is relatively long, and the tail of dorsal fin is relatively sharp. The dorsal fin of female ruby fish is relatively short, and the tail of the dorsal fin is relatively blunt.
3. Difference of caudal fin: The caudal fin of male ruby fish is flat at the end, and the length of the whole caudate fin is longer. The tail fin of female ruby fish is blunt and fan-shaped, and the length of the whole tail fin is relatively short.
4. Abdominal difference: This is the difference in reproduction. The female ruby fish has a larger abdomen during the breeding season because she has to lay eggs. The male ruby fish does not have a significantly larger abdomen during the breeding season.
ruby fish male fish can be raised together. They rarely come into conflict. But there are exceptions. If the two fish really don't like each other, they may fight. Therefore, they can generally be placed in the same tank for a period of time, if they can live in peace, they can be raised together. If they fight with each other, they need to be separated.
