Pseudomugil gertrudae A stunning Blue Eye Rainbowfish featuring dazzling spotted fins, brilliant sapphire-blue eyes, and peaceful schooling behaviour that's perfect for planted nano aquariums. Quick Facts Scientific name: Pseudomugil gertrudae Common name: Gertrude's Spotted Blue Eye Adult size: 3–4 cm Tank size: 40L+ recommended Difficulty: 🟢 Easy Temperament: Peaceful Best kept: Schools of 8 or more Is this for you? ✔️ Perfect if: You want one of the most beautiful Blue Eye species. You keep planted nano aquariums. You enjoy peaceful schooling fish. You appreciate fascinating display behaviour. ❌ Avoid if: You keep aggressive or fin-nipping fish. You plan on keeping only one or two individuals. Your aquarium has excessive water flow. You don't have a secure-fitting lid. Why choose Pseudomugil gertrudae? Gertrude's Spotted Blue Eye is widely regarded as one of the most attractive members of the Blue Eye Rainbowfish family. Mature males develop beautifully elongated fins covered in distinctive black spotting, perfectly complemented by their striking electric-blue eyes. Constantly active but completely peaceful, they spend their day schooling through planted aquariums while males display to one another with extended fins and graceful courtship dances. Their combination of intricate finnage, bright eyes and shimmering golden body makes them a true centrepiece in any planted nano aquarium. Common mistakes Keeping too few fish. Housing them with aggressive or fin-nipping species. Using an uncovered aquarium—they are excellent jumpers. Providing too little plant cover. Allowing water quality to decline. Care made simple Temperature: 22–28°C pH: 6.0–7.5 Diet: Premium nano pellets, baby brine shrimp, microworms, daphnia and frozen foods Water: Clean, stable and well-filtered with gentle flow Setup: Heavily planted aquarium with floating plants, open swimming space and a secure lid Pairs perfectly with Pseudomugil luminatus Pseudomugil tenellus Threadfin Rainbowfish Corydoras Java Moss and fine-leaved aquatic plants NTA Insight: If we had to recommend just one Blue Eye species based purely on appearance, Gertrude's Spotted Blue Eye would be near the top of the list. The intricate black spotting across the fins is unlike any other Pseudomugil species, and when a group of mature males displays together, they create one of the most spectacular sights in the nano fish hobby. FAQ How many Pseudomugil gertrudae should I keep? They should be kept in schools of at least eight individuals. Larger groups produce better colours, more confident behaviour and more frequent display activity. Can they live with shrimp? Yes. Adult shrimp are generally safe, although tiny shrimplets may occasionally be eaten. Dense mosses provide excellent shelter for young shrimp. Are they suitable for beginners? Yes. Gertrude's Spotted Blue Eyes are hardy, peaceful and relatively easy to care for, making them an excellent choice for planted community aquariums. Can they breed in home aquariums? Absolutely. They readily spawn amongst fine-leaved plants and spawning mops, with eggs being laid individually over an extended period. What makes Gertrude's Spotted Blue Eye different? Their distinctive spotted fins, brilliant blue eyes and elegant display behaviour make them one of the most visually striking and sought-after Blue Eye Rainbowfish available.