Here is the double-fan-tail, a gorgeous pastel fish whose hues change from lavender to green depending on the lighting:
And here is the comb-tail betta, whose tail extends to look like a comb with the teeth set far apart. He is older than the pastel betta, so he is much larger. His colors are blue, green and red in deep, jewel tones:
The bubbles you see on the top of the water shows that each male is building a nest, hoping to attract a female. That means the water conditions are just right for them.