{"product_id":"spotted-blue-eye-rainbowfish","title":"Gertrude Blue Eye Rainbowfish (Pseudomugil gertrudae)","description":"\u003cbody\u003e\n\n\n  \n\u003cmeta name=\"viewport\" content=\"width=device-width,initial-scale=1.0\"\u003e\n  \u003ctitle\u003eSpotted Blue-Eye - Superior Shrimp and Aquatics\u003c\/title\u003e\n  \u003clink href=\"https:\/\/fonts.googleapis.com\/css2?family=Playfair+Display:wght@400;600;700\u0026amp;family=DM+Sans:wght@300;400;500\u0026amp;display=swap\" rel=\"stylesheet\"\u003e\n  \u003cstyle\u003e\n\n    .ssa-pd *, .ssa-pd *::before, .ssa-pd *::after { box-sizing: border-box; }\n    @keyframes fadeUp { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }\n    .ssa-pd { font-family: 'DM Sans', sans-serif !important; color: #1e1a1a !important; background: #fff !important; line-height: 1.75 !important; }\n    .ssa-pd .hero { background: linear-gradient(150deg, #111111 0%, #2a0000 60%, #F40909 100%) !important; padding: 3.5rem 3rem 2.8rem !important; 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}\n  \n  \u003c\/style\u003e\n\n\n\u003cdiv class=\"ssa-pd\"\u003e\n  \u003cdiv class=\"hero\"\u003e\n    \u003cstyle\u003e.ssa-pd .hero::before{content:\"\u0026#128032;\";}\u003c\/style\u003e\n    \u003cspan class=\"hero-tag\"\u003eFreshwater Fish\u003c\/span\u003e\n    \u003ch1\u003eSpotted Blue-Eye\u003c\/h1\u003e\n    \u003cp class=\"hero-sub\"\u003eA translucent-bodied nano rainbowfish from Northern Australia and Papua New Guinea with vivid blue eyes and elaborately patterned fan-like fins edged in black and yellow. One of the most delicate and most beautiful fish in the freshwater hobby.\u003c\/p\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"feature-pills\"\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Translucent Body with Vivid Blue Eyes\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Spotted Fan-Like Fins\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Pseudomugil gertrudae\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e pH 4.5–7.5\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Group of 8 or More\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Excellent Shrimp Companion\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"body-wrap\"\u003e\u003cdiv class=\"prose\"\u003e\n    \u003cp\u003e\u003cstrong\u003eSpotted Blue-Eye\u003c\/strong\u003e (\u003cem\u003ePseudomugil gertrudae\u003c\/em\u003e), also known as the Spotted Blue-Eye or Gertrude's Rainbowfish, is a tiny, ethereally beautiful nano rainbowfish native to shallow, slow-moving streams, pools, and vegetated swamps in Northern Australia and Papua New Guinea. The body is translucent to pale silver-white with subtle warm tints, giving the fish an almost luminous quality, and the eyes are a vivid, clearly visible blue. The fins -- particularly the dorsal and anal fins of adult males -- are elaborately developed into broad, spotted fan-like structures edged in black and yellow that the males spread and display continuously when competing for female attention. This constant displaying behaviour, combined with the fish's small size and delicate colouration, makes a well-kept group of Spotted Blue-Eyes one of the most visually engaging nano tank inhabitants available. They require a mature, densely planted tank, a group of 8 or more, and small food. One of the most shrimp-compatible fish in the hobby due to their tiny mouth size.\u003c\/p\u003e\n    \u003cdiv class=\"stat-row\"\u003e\n      \u003cdiv class=\"stat-card\"\u003e\n\u003cspan class=\"stat-value\"\u003e4.5–7.5\u003c\/span\u003e\u003cspan class=\"stat-label\"\u003epH\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"stat-card\"\u003e\n\u003cspan class=\"stat-value\"\u003e1–10\u003c\/span\u003e\u003cspan class=\"stat-label\"\u003eGH (dGH)\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"stat-card\"\u003e\n\u003cspan class=\"stat-value\"\u003e72–82°F\u003c\/span\u003e\u003cspan class=\"stat-label\"\u003eTemperature\u003c\/span\u003e\n\u003c\/div\u003e\n      \u003cdiv class=\"stat-card\"\u003e\n\u003cspan class=\"stat-value\"\u003e1.2 in\u003c\/span\u003e\u003cspan class=\"stat-label\"\u003eMax Size\u003c\/span\u003e\n\u003c\/div\u003e\n    \u003c\/div\u003e\n    \n    \u003cspan class=\"section-label\"\u003eAppearance \u0026amp; Display Behaviour\u003c\/span\u003e\n    \u003ch2\u003eFan Fins, Blue Eyes \u0026amp; Constant Displaying\u003c\/h2\u003e\n    \u003cdiv class=\"bullet-list\"\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eTranslucent body with vivid blue eyes -- the colouration is subtle but striking at close range.\u003c\/strong\u003e The body of \u003cem\u003eP. gertrudae\u003c\/em\u003e is pale and translucent, allowing internal structures to be faintly visible through the body wall. Subtle silver, turquoise, and yellow tints are present, particularly in males, and the iridescence shifts as the fish moves through different light angles. The blue eyes are the most immediately striking colour element and are clearly visible from across the tank.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eElaborately patterned fan-like fins on adult males -- spread continuously during display.\u003c\/strong\u003e Male Spotted Blue-Eyes develop distinctly enlarged dorsal and anal fins patterned with spots and edged in black and yellow. These fins are spread and held erect continuously as males display to rivals and potential mates, creating a constant visual spectacle of fin-fanning and colour-intensifying behaviour that smaller-finned fish cannot replicate. The displaying is not aggressive -- it is performative and fascinating to observe.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eKeep in groups of 8 or more -- timid and pale in small numbers.\u003c\/strong\u003e In groups below 6 Spotted Blue-Eyes are shy, hide frequently, and show faded colour. In a group of 8 or more they emerge confidently, display continuously, and show their full colouration. A school of 10 to 15 in a well-planted blackwater setup is the minimum for the full display behaviour the species is known for.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eRequires a biologically mature, densely planted tank -- sensitive to water quality fluctuations.\u003c\/strong\u003e This species is not suitable for a new or cycling aquarium. It requires stable, established water chemistry and will decline quickly in response to ammonia spikes, nitrite, or significant pH shifts. A tank running for at least 3 months before introduction is recommended. Dense fine-leaved planting, floating plants to diffuse light, and driftwood to add tannins create the ideal environment.\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cspan class=\"section-label\"\u003eShrimp Compatibility\u003c\/span\u003e\n    \u003ch2\u003eAmong the Most Shrimp-Safe Fish Available\u003c\/h2\u003e\n    \u003cdiv class=\"bullet-list\"\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eTiny mouth -- adult Neocaridina and Caridina shrimp are completely safe.\u003c\/strong\u003e The mouths of Spotted Blue-Eyes are so small that adult shrimp of any size are entirely beyond what the fish can consume. Only the very smallest newly hatched shrimplets in their first few days of life are at any risk. In a planted tank with moss and fine-leaved plants, shrimplet survival alongside Spotted Blue-Eyes is very high. This makes them one of the most genuinely shrimp-safe fish available.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eParameter overlap with both Neocaridina and Caridina is excellent.\u003c\/strong\u003e \u003cem\u003eP. gertrudae\u003c\/em\u003e tolerates pH 4.5 to 7.5 and soft to moderately soft water, spanning both the Neocaridina and Caridina parameter ranges. The fish performs well in tannin-stained water, aligning particularly naturally with a Caridina blackwater setup. Avoid mixing with other Pseudomugil species in breeding tanks as hybridisation is possible.\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"tip-box\"\u003e\n\u003cspan class=\"tip-label\"\u003eKeeper's Note\u003c\/span\u003e\u003cp\u003eA group of 12 Spotted Blue-Eyes in a 15-gallon blackwater planted tank with Almond Leaves, Java Moss, fine dark substrate, and a colony of Crystal Red or Neocaridina shrimp is one of the most elegant and most visually sophisticated nano tank setups achievable in the freshwater hobby. The constant displaying of the male fins, the translucent bodies catching light, and the shrimp moving below create a living display that rewards close observation indefinitely. Feed small foods twice daily and maintain stable water quality -- this species repays careful husbandry with outstanding long-term colour and behaviour.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003ca href=\"\/es\/collections\/freshwater-fish-parent\" class=\"cta-block\" title=\"🐠 browse more freshwater fishbrowse our full freshwater fish collection. →\" aria-label=\"🐠 browse more freshwater fishbrowse our full freshwater fish collection. →\"\u003e\u003cspan class=\"cta-icon\"\u003e🐠\u003c\/span\u003e\u003cdiv class=\"cta-text\"\u003e\n\u003cstrong\u003eBrowse more freshwater fish\u003c\/strong\u003e\u003cp\u003eBrowse our full \u003cspan style=\"color:#F40909;font-weight:500;\"\u003eFreshwater Fish collection\u003c\/span\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cspan style=\"color:rgba(255,255,255,0.4);font-size:1.4rem;\"\u003e→\u003c\/span\u003e\u003c\/a\u003e\n    \u003cdiv class=\"policy-bar\"\u003e\n      \u003cspan\u003eBefore placing your order, please review our\u003c\/span\u003e\n      \u003ca href=\"\/es\/pages\/doa-policy\" title=\"Doa policy\" aria-label=\"Doa policy\"\u003eDOA Policy\u003c\/a\u003e\n      \u003ca href=\"\/es\/pages\/shipping-info-practices\" title=\"Shipping info\" aria-label=\"Shipping info\"\u003eShipping Info\u003c\/a\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/body\u003e","brand":"Superior Shrimp \u0026 Aquatics","offers":[{"title":"1","offer_id":45089095450832,"sku":null,"price":6.0,"currency_code":"USD","in_stock":true},{"title":"3","offer_id":45089095483600,"sku":null,"price":18.0,"currency_code":"USD","in_stock":true},{"title":"6","offer_id":45089095516368,"sku":null,"price":34.0,"currency_code":"USD","in_stock":true},{"title":"12","offer_id":45089095549136,"sku":null,"price":68.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0639\/2895\/9184\/files\/gertrude-blue-eye-rainbowfish-pseudomugil-gertrudae-placeholder-666.webp?v=1785437527","url":"https:\/\/www.superiorshrimpaquatics.com\/es\/products\/spotted-blue-eye-rainbowfish","provider":"Superior Shrimp \u0026 Aquatics","version":"1.0","type":"link"}