{"product_id":"slim-aquarium-tunnel-against-glass-buried","title":"Blubber Cove Slim Aquarium Tunnel – Against-Glass Buried Hide for Aquascapes","description":"\u003cp\u003eThe \u003cstrong\u003eBlubber Cove Slim Aquarium Tunnel\u003c\/strong\u003e is an ultra-thin buried tunnel designed to run along the back or side glass of your tank. At just 40mm tall on the Standard size, it disappears under shallow substrate where bulkier caves can't go — making it the right choice for aquascapes with only 2-3cm of substrate depth, or for keepers who want shelter without sacrificing visual tank space. Place it flush against the glass and bury under sand, gravel or aquasoil. UK 3D-printed in aquarium-safe PETG.\u003c\/p\u003e\n\n\u003ch2\u003eWhy slim and against-the-glass?\u003c\/h2\u003e\n\u003cp\u003eMost buried aquarium tunnels are too tall for aquascape-style setups. If you run a shallow substrate (common in planted tanks, iwagumi scapes and nano competitions), a 60mm+ tunnel either pokes above the substrate or forces you to over-mound sand around it — both of which break the natural look. This tunnel solves that. At 40mm tall, it buries completely in standard 4-5cm aquascape substrate, and the slim 42mm width tucks tight against the back or side glass so it stays out of the visible tank space entirely. Fish and shrimp get the shelter; your scape stays clean.\u003c\/p\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eUltra-slim 40mm profile — buries fully in shallow aquascape substrate\u003c\/li\u003e\n  \u003cli\u003eDesigned for against-glass placement — runs along back or side wall\u003c\/li\u003e\n  \u003cli\u003eLong tunnel shape — extended interior shelter for shrimp colonies and shoaling fish\u003c\/li\u003e\n  \u003cli\u003eSubstrate-friendly top — bury fully or partially under sand, gravel or aquasoil\u003c\/li\u003e\n  \u003cli\u003eSmooth interior — safe for delicate fins, shrimp moults and tiny fry\u003c\/li\u003e\n  \u003cli\u003e3D-printed in Northumberland, UK from aquarium-safe PETG\u003c\/li\u003e\n  \u003cli\u003eIdeal for planted tanks, nano aquascapes and shallow-substrate setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aquarium-safe PETG plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStandard size:\u003c\/strong\u003e 210 × 42 × 40 mm (tunnel openings 35 × 42 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge size:\u003c\/strong\u003e 266 × 52 × 48 mm (tunnel openings 43 × 53 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlacement:\u003c\/strong\u003e Against tank glass — back or side wall\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate depth needed:\u003c\/strong\u003e 4-5cm minimum to fully bury Standard, 5-6cm for Large\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColours:\u003c\/strong\u003e Black, White, Beige, Marble, Green\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e Northumberland, United Kingdom\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Blubber Cove\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIdeal for these setups\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePlanted aquascapes with shallow substrate (iwagumi, Dutch, nature-style)\u003c\/li\u003e\n  \u003cli\u003eNano shrimp tanks where decor needs to be invisible\u003c\/li\u003e\n  \u003cli\u003eAquascape competition tanks (no visible plastic decor)\u003c\/li\u003e\n  \u003cli\u003eCommunity freshwater tanks with corydoras and shy nano species\u003c\/li\u003e\n  \u003cli\u003eFry grow-out tanks where flat tunnel cover protects babies from current\u003c\/li\u003e\n  \u003cli\u003eBreeding setups for shrimp colonies wanting low-profile hides\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSuitable species\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eNeocaridina and Caridina shrimp (colony grazing along extended interior)\u003c\/li\u003e\n  \u003cli\u003eCorydoras (panda, pygmaeus, bronze)\u003c\/li\u003e\n  \u003cli\u003eKuhli loaches and weather loaches\u003c\/li\u003e\n  \u003cli\u003eShrimp fry and small fish fry of any peaceful species\u003c\/li\u003e\n  \u003cli\u003eNano fish — chili rasbora, ember tetra, celestial pearl danio\u003c\/li\u003e\n  \u003cli\u003eEndler and guppy fry during grow-out\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eHow to install\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003ePosition the tunnel flush against the back or side glass before adding substrate\u003c\/li\u003e\n  \u003cli\u003ePour sand, gravel or aquasoil directly over the top\u003c\/li\u003e\n  \u003cli\u003eKeep both tunnel openings clear so fish can enter and exit\u003c\/li\u003e\n  \u003cli\u003ePlant low-light species (cryptocoryne, anubias, moss) directly above for extra disguise\u003c\/li\u003e\n  \u003cli\u003eWithin a day or two, shrimp and bottom-dwellers will claim it as territory\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eHow is this different from your other buried tunnels?\u003c\/h2\u003e\n\u003cp\u003eThree buried tunnel options, three different placement intents:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSlim Against-Glass Tunnel (this one):\u003c\/strong\u003e ultra-thin 40mm profile, runs along the back or side glass, disappears in shallow aquascape substrate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLong Buried Tunnel:\u003c\/strong\u003e taller 62mm profile, free-placed anywhere along the tank bottom, available with left\/right directional mirror variants\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnderground Corner Cave:\u003c\/strong\u003e square 135mm corner-fit, buries in the back 90° corner as a single-chamber hide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003ePick this one if your scape has shallow substrate or you want the tunnel completely hidden against the glass.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWill it actually disappear in my substrate?\u003c\/h3\u003e\n\u003cp\u003eIf you have at least 4-5cm of substrate depth, yes. The Standard's 40mm height buries completely under standard aquascape substrate depth, leaving only the openings visible. The Large needs 5-6cm to fully disappear.\u003c\/p\u003e\n\n\u003ch3\u003eDoes it have to go against the glass?\u003c\/h3\u003e\n\u003cp\u003eIt's designed for it — the flat back edge sits flush against vertical glass. You can free-place it in open substrate, but the slim profile means it's less stable than our wider Long Buried Tunnel when not glass-supported. For free-placement, the Long Buried Tunnel is the better choice.\u003c\/p\u003e\n\n\u003ch3\u003eWill shrimp use it?\u003c\/h3\u003e\n\u003cp\u003eYes — and especially well. The long enclosed shape is one of the best shrimp colony designs because the extended interior gives multiple grazing zones for whole colonies. PETG is shrimp-safe with no copper or leaching.\u003c\/p\u003e\n\n\u003ch3\u003eWill the substrate weight crush it?\u003c\/h3\u003e\n\u003cp\u003eNo. PETG is rigid and the tunnel is engineered to take substrate load even on the slim profile. You can cover with several centimetres of sand, gravel or aquasoil without warping.\u003c\/p\u003e\n\n\u003ch3\u003eCan I plant on top?\u003c\/h3\u003e\n\u003cp\u003eYes — low-light plants like cryptocoryne, anubias and moss carpets work beautifully above the buried tunnel. Roots grow around the structure and the planting hides any subtle bulge in the substrate line.\u003c\/p\u003e\n\n\u003ch3\u003eHow do fry use it?\u003c\/h3\u003e\n\u003cp\u003eThe tunnel becomes a fry-only zone — adults can swim through but the long enclosed shape makes it a calm shelter where shrimplets and small fry can grow without being chased. Many breeders report visible fry survival increases.\u003c\/p\u003e\n\n\u003ch3\u003eHow do I clean it?\u003c\/h3\u003e\n\u003cp\u003eMost owners leave it buried permanently — debris washes through naturally with water changes. For deep cleaning, gently lift from substrate, rinse in tank water, and reposition. Never use soap or detergent.\u003c\/p\u003e\n\n\u003ch2\u003eWhy buy from Blubber Cove\u003c\/h2\u003e\n\u003cp\u003eOriginal aquascaper-designed pieces, 3D-printed to order in our Northumberland workshop in aquarium-safe PETG. The Slim Against-Glass Tunnel was designed specifically for premium aquascape setups where conventional decor is too bulky. Free UK delivery over £30.\u003c\/p\u003e\n","brand":"Blubber Cove","offers":[{"title":"Black \/ Standard","offer_id":49761961410824,"sku":"","price":9.1,"currency_code":"GBP","in_stock":true},{"title":"Black \/ Large","offer_id":49761961443592,"sku":"","price":11.95,"currency_code":"GBP","in_stock":true},{"title":"White \/ Standard","offer_id":49761961476360,"sku":"","price":9.1,"currency_code":"GBP","in_stock":true},{"title":"White \/ Large","offer_id":49761961509128,"sku":"","price":11.95,"currency_code":"GBP","in_stock":true},{"title":"Beige \/ Standard","offer_id":49761961541896,"sku":"","price":9.1,"currency_code":"GBP","in_stock":true},{"title":"Beige \/ Large","offer_id":49761961574664,"sku":"","price":11.95,"currency_code":"GBP","in_stock":true},{"title":"Marble \/ Standard","offer_id":49761961607432,"sku":"","price":9.1,"currency_code":"GBP","in_stock":true},{"title":"Marble \/ Large","offer_id":49761961640200,"sku":"","price":11.95,"currency_code":"GBP","in_stock":true},{"title":"Green \/ Standard","offer_id":49761961672968,"sku":"","price":9.1,"currency_code":"GBP","in_stock":true},{"title":"Green \/ Large","offer_id":49761961705736,"sku":"","price":11.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0880\/7114\/3688\/files\/substrate-aquarium-tunnel-for-fish-and-shrimp-433498.jpg?v=1771496760","url":"https:\/\/www.getwarsplay.com\/products\/slim-aquarium-tunnel-against-glass-buried","provider":"WarSplay","version":"1.0","type":"link"}