Blue Turquoise Rainbow (Melanotaenia lacustris) Loaches giving this fish a glowing

giving this fish a glowing appearance under strong lighting

It's characterized by its distinct coloration

Reaching around 7–8 inches

Recommended: 240+ gallons for long-term care

where they typically live near the shore in fast-flowing water

Blue Turquoise Rainbow (Melanotaenia lacustris) Loaches giving this fish a glowingBlue Turquoise Rainbow Melanotaenia lacustris Liquid sapphire in constant motion The Blue Turquoise Rainbow is one of the most striking freshwater schooling fish available. A brilliant metallic blue body shifts into turquoise and aqua tones depending on angle and lighting, creating a liquid, iridescent effect as the fish turns. Mature males develop deeper coloration and a taller, more pronounced body shape, especially when displaying to females.