{"product_id":"cosmic-blue-danios-danio-rerio","title":"Cosmic Blue Danios (Danio rerio)","description":"\u003cbody\u003e\n\n\n  \n\u003cmeta name=\"viewport\" content=\"width=device-width,initial-scale=1.0\"\u003e\n  \u003ctitle\u003eCosmic Blue Danio - 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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color: #6b6060 !important; line-height: 1.9 !important; margin-bottom: 1.6rem !important; font-weight: 300 !important; }\n    .ssa-pd .prose p strong { color: #111111 !important; font-weight: 500 !important; }\n    .ssa-pd .prose a { color: #b50707 !important; text-decoration: underline !important; text-underline-offset: 3px; }\n    .ssa-pd .section-label { font-size: 0.78rem !important; font-weight: 500 !important; letter-spacing: 0.2em !important; text-transform: uppercase !important; color: #F40909 !important; margin: 2.8rem 0 0.5rem !important; display: block !important; }\n    .ssa-pd .prose h2 { font-family: 'Playfair Display', serif !important; font-size: 2rem !important; font-weight: 600 !important; color: #1e1a1a !important; margin: 0 0 1.1rem !important; padding-bottom: 0.5rem !important; border-bottom: 2px solid #e8e2da !important; line-height: 1.25 !important; background: transparent !important; text-transform: none !important; letter-spacing: normal !important; }\n    .ssa-pd .stat-row { display:grid !important;grid-template-columns:repeat(auto-fit,minmax(130px,1fr)) !important;gap:0.85rem !important;margin:1.6rem 0 2.2rem !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\u003eCosmic Blue Danio\u003c\/h1\u003e\n    \u003cp class=\"hero-sub\"\u003eA luminous, iridescent blue nano danio with active schooling behaviour and a broad parameter tolerance. A visually striking and hardy addition to planted shrimp tanks.\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 Iridescent Blue Body\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Active Schooling Fish\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Danio rerio (GloFish)\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e pH 6.5–7.5\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Hardy \u0026amp; Adaptable\u003c\/span\u003e\n    \u003cspan class=\"fpill\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e Shrimp Compatible\u003c\/span\u003e\n  \u003c\/div\u003e\n  \u003cdiv class=\"body-wrap\"\u003e\u003cdiv class=\"prose\"\u003e\n    \u003cp\u003e\u003cstrong\u003eCosmic Blue Danios\u003c\/strong\u003e (\u003cem\u003eDanio rerio\u003c\/em\u003e) are a GloFish variant of the Zebra Danio with a vivid fluorescent blue body that catches light vividly as the fish moves through the water column. The colour is produced by an inserted fluorescent protein gene and does not fade over the fish's lifetime, unlike dyed or painted fish. Active, hardy, and tolerant of a wide range of water parameters, they are one of the more straightforward nano fish to keep long-term and one of the most visually striking at their size. The cool blue colouration creates a striking contrast against warm-toned shrimp like \u003ca href=\"\/collections\/neocaridina-shrimp-parent\" title=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\" aria-label=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\"\u003eFire Red Cherry\u003c\/a\u003e or \u003ca href=\"\/collections\/neocaridina-shrimp-parent\" title=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\" aria-label=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\"\u003eSunkist\u003c\/a\u003e in a planted display tank.\u003c\/p\u003e\n    \u003cdiv class=\"stat-row\"\u003e\n      \u003cdiv class=\"stat-card\"\u003e\n\u003cspan class=\"stat-value\"\u003e6.5–7.5\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\"\u003e4–12\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\"\u003e65–75°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 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; Behaviour\u003c\/span\u003e\n    \u003ch2\u003eIridescent Blue in Motion\u003c\/h2\u003e\n    \u003cdiv class=\"bullet-list\"\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eLuminous iridescent blue body that shifts and flashes with movement.\u003c\/strong\u003e Like the Neon Tetra, the blue of the Cosmic Blue Danio is structural rather than purely pigment-based, producing an intensity and depth of colour that changes as the fish moves and the light angle shifts. In a group the collective shimmer of a school turning in synchrony is one of the most visually engaging effects a nano tank can produce.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eActive, energetic schooling behaviour throughout the full water column.\u003c\/strong\u003e Cosmic Blue Danios are more active and cover more of the tank than the mid-level-preferring CPD or the surface-oriented White Cloud. They move through upper, mid, and lower zones of the tank, which gives a planted display tank consistent movement at every level. Their energy level is higher than most nano fish but not disruptive to calmer tankmates.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eSchool of 6 minimum, 10 or more for best behaviour and colour display.\u003c\/strong\u003e Like all danios, Cosmic Blues school more tightly and show better colour in larger groups. A school of 10 in a 10 to 20-gallon planted tank produces confident, active behaviour and the full collective shimmer effect the species is known for.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eHardy and tolerant of a wide parameter range -- one of the more beginner-friendly nano fish.\u003c\/strong\u003e Cosmic Blue Danios tolerate pH 6.5 to 7.5 and moderate hardness, covering the standard Neocaridina range comfortably. They are more forgiving of parameter fluctuations than CPDs or Chili Rasboras and recover well from minor water quality events in an established tank.\u003c\/span\u003e\n    \u003c\/div\u003e\n    \u003cspan class=\"section-label\"\u003eShrimp Compatibility\u003c\/span\u003e\n    \u003ch2\u003eGood Companion with Planted Cover\u003c\/h2\u003e\n    \u003cdiv class=\"bullet-list\"\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eAdult Neocaridina shrimp are safe -- shrimplets are at moderate risk.\u003c\/strong\u003e Cosmic Blue Danios are active and will investigate and consume shrimplets. Adult shrimp at full size are too large to be targeted. In a heavily planted tank with abundant fine-leaved plant cover and moss, shrimplet survival rates are adequate for maintaining a breeding colony alongside the fish. In a sparse tank shrimplet survival will be low.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eCool blue colouration creates strong visual contrast with warm-toned shrimp.\u003c\/strong\u003e The iridescent blue of the Cosmic Blue Danio reads as a direct visual counterpoint to red, orange, and yellow Neocaridina morphs. A school of Cosmic Blues with a colony of \u003ca href=\"\/collections\/neocaridina-shrimp-parent\" title=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\" aria-label=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\"\u003eFire Red Cherry\u003c\/a\u003e or \u003ca href=\"\/collections\/neocaridina-shrimp-parent\" title=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\" aria-label=\"Neocaridina shrimp | colorful freshwater clean-up crew – superior shrimp \u0026amp; aquatics\"\u003eSunkist\u003c\/a\u003e shrimp on dark substrate produces a warm-cool contrast that is immediately striking and that works at every scale of observation.\u003c\/span\u003e\n      \u003cspan class=\"bl-item\"\u003e\u003cstrong\u003eTemperature overlap with Neocaridina is excellent.\u003c\/strong\u003e Cosmic Blue Danios prefer 65 to 75°F, which aligns closely with the Neocaridina preference of 65 to 78°F. No heater compromise is required and both species perform well in the 68 to 74°F range that suits each comfortably.\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\u003eCosmic Blue Danios paired with Fire Red Cherry or Sunkist shrimp on black sand substrate with green planted background is one of the most straightforward high-impact display combinations available in the nano tank hobby. The blue-and-red or blue-and-orange contrast between fish and shrimp is complementary in the colour theory sense -- cool against warm -- and both species are beginner-friendly, hardy, and available. Plant densely with Java Moss and Rotala in the background, add the Danios first and let the tank settle for two weeks before introducing shrimp.\u003c\/p\u003e\n\u003c\/div\u003e\n    \u003ca href=\"\/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=\"\/pages\/doa-policy\" title=\"Live arrival guarantee | superior shrimp \u0026amp; aquatics\" aria-label=\"Live arrival guarantee | superior shrimp \u0026amp; aquatics\"\u003eDOA Policy\u003c\/a\u003e\n      \u003ca href=\"\/pages\/shipping-info-practices\" title=\"Shipping policies, info \u0026amp; practices – superior shrimp \u0026amp; aquatics\" aria-label=\"Shipping policies, info \u0026amp; practices – superior shrimp \u0026amp; aquatics\"\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":45041258430672,"sku":null,"price":8.0,"currency_code":"USD","in_stock":true},{"title":"3","offer_id":45041258463440,"sku":null,"price":24.0,"currency_code":"USD","in_stock":true},{"title":"6","offer_id":45041258496208,"sku":null,"price":30.0,"currency_code":"USD","in_stock":true},{"title":"12","offer_id":45041258528976,"sku":null,"price":96.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0639\/2895\/9184\/files\/cosmic-blue-danios-danio-rerio-placeholder-graphic-458.webp?v=1781633658","url":"https:\/\/www.superiorshrimpaquatics.com\/products\/cosmic-blue-danios-danio-rerio","provider":"Superior Shrimp \u0026 Aquatics","version":"1.0","type":"link"}