Betta fish are incredibly popular ... Rainbowfish come in a slew of colors, including the blue-green-white gradient of the Lake Kutubu rainbowfish. They can reach 4.8 inches (12 centimeters ...

What is a betta fish? Betta fish—also known as Siamese ... and are a dull gray, green, olive, or brown. Before mating, the male spends hours blowing bubbles at the water’s surface to build ...