Cobalt Blue Half-moon Betta Fish

The Cobalt Blue Half-moon Betta Fish (Betta splendens) is distinguished by its deep blue colouration and an expansive tail that fans out to a full 180 degrees. Reaching an adult size of 6–7 cm,  Originally from the shallow, warm waters of Southeast Asia, they bring an azure pop of colour to the mid-to-upper levels of the aquarium.

The Cobalt Blue Half-moon Betta Fish are best kept alone, but we strongly suggest a tank of at least 20 litres with a low-flow filter to protect their delicate, heavy fins. While they are often sold in small bowls, they actually need a heated and filtered environment to maintain their vibrant health and active personality. They are remarkably hardy and handle a pH range of 6.5–7.5, but they truly thrive in warm, stable conditions.

Avoid housing your cobalt blue half-moon betta fish any tank mates with long fins or “nippy” tendencies which may damage the Betta’s spectacular tail. Since they are surface-oriented insectivores with a labyrinth organ that allows them to breathe air, feed floating pellets that won’t sink too quickly. Their favourite meals include frozen or live bloodworms, brine shrimp, and daphnia.