Blue King Tetras are peaceful, active mid-water fish that do best in a planted, low-flow aquarium of at least 10–20 gallons. They thrive in soft to moderately hard water with a pH of 6.0–7.5 and temperatures between 74–82 °F (23–28 °C). These tetras should be kept in schools of six or more to feel secure and display their best colors. Their diet should include quality flakes or micro pellets supplemented with live or frozen foods like brine shrimp and bloodworms. A darker substrate, floating plants, and hiding spots help reduce stress and mimic their natural habitat.
 
Feature
Details
Tank Size
Minimum 10 gallons (20+ gallons preferred for groups)
Temperature
74–82 °F (23–28 °C)
pH Range
6.0–7.5
Water Hardness
5–15 dGH (soft to moderately hard)
Diet
Omnivore – flakes, pellets, live/frozen foods
Temperament
Peaceful, schooling – best in groups of 6+
Tank Setup
Planted tank, moderate flow, dark substrate
Tank Mates
Other peaceful small fish and invertebrates