Many marine fish are well suited for keeping them in pairs. In this case, as far as possible, a male and female should be kept together, because same-sex constellation might threaten the reef tank harmony. Unfortunately, the sexes in fish are not always easy to determine and may even change in the course of a fish life. In order to facilitate the pairing, you will find in this section only fish that have come together in our system and have been sharing a tank harmoniously for a long time. Occasionally, we can even offer you breeding pairs. These are fish pairs that have already spawned together. Breeding pairs are the ideal candidates, if you want to try culturing by yourself.