that amply reveal themselves in the survey above, but also most of them are distinct temperamental. That makes the "watching fishes before the pane" to a more than only an interesting pass time. They choose a territory, that they defend against congeners and other fishes, dig tremendous holes at which the throw the bottom materials up until high against the window, to take away in that way the sight at their activities, carefully clean a flat stone or a peace of peak to put on it at least their spawn; a large number of little eggs. And during this range of acts they mutually communicate with all kinds of movements but particulary color changes play an important role. And the almost touching care for spawn and offspring, that activates to humanize the animals, and appeals to the imagination of many an aquarist.