Did you know, when a male dwarf gourami becomes territorial (which happens when plants and potential spawning partners are intoduced along with another male dwarf gourami) its chest will develop a vibrant purple display?
pfff. |D "The male will swim around near the female while flaring his fins. He will then attempt to draw her to his bubblenest. If the female accepts the male and is ready to spawn, she will swim in circles beneath the bubblenest. When she is ready to release her eggs, she will touch the male on his back or on his tail with her mouth. The male will then embrace her and turn her first on her side, and then onto her back."