The water temperature of swallow fish is similar to that of other tropical fish, around 18-28 degrees, and the best is around 24 degrees. It depends on whether you chose it when you bought it. If you don’t choose it, you will basically be wiped out. To be honest, the swallow fish is not easy to raise compared to the black Mary, but the black Mary is not as good-looking as the swallow fish. If you are a novice, start with the easy ones first. Nowadays, many of the fish bought in fish shops die after being raised for a long time. There are many reasons. Therefore, it is recommended to raise the fish first. If you raise one kind of fish well, it will be much easier to raise other fish.