{"product_id":"underground-aquarium-cave-bury-under-sand","title":"Blubber Cove Underground Aquarium Cave – Bury Under Sand or Gravel","description":"\u003cp\u003eThe \u003cstrong\u003eBlubber Cove Underground Aquarium Cave\u003c\/strong\u003e is designed to disappear. Pour your sand or gravel directly over the top and the cave becomes a hidden underground tunnel — only the corner openings are visible. Your fish gain a fully shaded retreat that looks like a natural cavity in the substrate, while your aquascape view stays completely clear. UK 3D-printed in aquarium-safe PETG.\u003c\/p\u003e\n\n\u003ch2\u003eThe substrate-on-top design\u003c\/h2\u003e\n\u003cp\u003eMost aquarium caves sit visibly in the tank — they're either decorative features or compromise the scape. This one is the opposite. The flat top and lip openings are engineered to be buried under your existing substrate, so the cave structure is invisible from above. Shrimp, bettas and corydoras get a proper enclosed tunnel system; you get to keep your minimalist or planted aquascape free of obvious plastic decor.\u003c\/p\u003e\n\n\u003ch2\u003eHow to set it up\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003ePlace the cave in the back corner of your tank before adding substrate\u003c\/li\u003e\n  \u003cli\u003ePour sand or gravel over the top — the flat lid takes substrate weight without sagging\u003c\/li\u003e\n  \u003cli\u003eLeave the side openings clear so fish can enter and exit\u003c\/li\u003e\n  \u003cli\u003eOptional: plant directly on top of the cave for hidden roots and a natural look\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eSubstrate-on-top design — bury under sand or gravel for a hidden underground tunnel\u003c\/li\u003e\n  \u003cli\u003eCorner-fit shape — uses the dead 90° back corner of the tank\u003c\/li\u003e\n  \u003cli\u003eFlat reinforced lid — supports substrate weight without warping\u003c\/li\u003e\n  \u003cli\u003eTwo side openings — fish enter one side, exit the other\u003c\/li\u003e\n  \u003cli\u003eSmooth interior — safe for delicate fins and shrimp moults\u003c\/li\u003e\n  \u003cli\u003e3D-printed in the UK from aquarium-safe PETG plastic\u003c\/li\u003e\n  \u003cli\u003eMaintains tank view — invisible from above once buried\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 135 × 135 × 60 mm (tunnel openings 53 × 95 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge size:\u003c\/strong\u003e 180 × 180 × 81 mm (tunnel openings 90 × 132 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlacement:\u003c\/strong\u003e 90-degree back corner, buried under substrate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSubstrate compatibility:\u003c\/strong\u003e sand, fine gravel, aquasoil, planted-tank substrate\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColours:\u003c\/strong\u003e Black, White, Marble Effect, Moss Green, Sand\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMade in:\u003c\/strong\u003e 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\u003eSuitable for aquariums\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eNeocaridina and Caridina shrimp\u003c\/li\u003e\n  \u003cli\u003eBetta splendens (Siamese fighting fish)\u003c\/li\u003e\n  \u003cli\u003eCorydoras (panda, bronze, pygmaeus)\u003c\/li\u003e\n  \u003cli\u003eKuhli loaches and weather loaches\u003c\/li\u003e\n  \u003cli\u003eBristlenose plecos and small catfish\u003c\/li\u003e\n  \u003cli\u003eApistogramma and dwarf cichlids\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAlso suitable for reptile and amphibian setups\u003c\/h2\u003e\n\u003cp\u003eWhile this cave is designed for aquariums, the same substrate-burial principle works for terrariums and vivariums. Compatible with axolotl tanks, crested gecko enclosures, snake hides and leopard gecko setups — bury under coco fibre, reptile sand or paludarium substrate for a natural underground hideout. PETG is non-toxic and won't leach in humid environments.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\n\u003ch3\u003eWill the cave collapse under the weight of my substrate?\u003c\/h3\u003e\n\u003cp\u003eNo — the lid is reinforced and engineered specifically to take substrate load. You can pour several inches of sand or gravel on top without any sagging or warping.\u003c\/p\u003e\n\n\u003ch3\u003eCan I plant on top of it?\u003c\/h3\u003e\n\u003cp\u003eYes. Many buyers plant low-light species like cryptocoryne, anubias or carpeting plants directly above the cave. The roots grow around the cave shell and the planting hides the structure further.\u003c\/p\u003e\n\n\u003ch3\u003eWill my fish find the openings if the cave is buried?\u003c\/h3\u003e\n\u003cp\u003eYes — keep the two side openings clear of substrate when you bury it. Fish find them within hours, and curious species like corydoras and kuhli loaches almost always claim the tunnel within a day.\u003c\/p\u003e\n\n\u003ch3\u003eIs it safe for shrimp?\u003c\/h3\u003e\n\u003cp\u003eYes. PETG is shrimp-safe (no copper, no leaching) and the interior is smooth so shrimp can moult and forage without injury.\u003c\/p\u003e\n\n\u003ch3\u003eCan I use it without burying it?\u003c\/h3\u003e\n\u003cp\u003eYes — it works as a visible corner cave too. But the substrate-on-top design is what makes this one different. If you want a fully visible corner cave, our Tall Mangrove Corner Cave or Wide Corner Cave are designed for above-substrate placement.\u003c\/p\u003e\n\n\u003ch3\u003eDoes it work for axolotls or geckos?\u003c\/h3\u003e\n\u003cp\u003eYes, as a secondary use. Axolotls use it as an underwater hide buried under fine sand. Crested geckos, leopard geckos and snakes use it as a humid hide buried under coco fibre or reptile substrate. PETG is non-toxic in both aquatic and terrestrial setups.\u003c\/p\u003e\n\n\u003ch2\u003eHow is this different from your other corner caves?\u003c\/h2\u003e\n\u003cp\u003eWe make several corner caves — pick by use case:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUnderground corner cave (this one):\u003c\/strong\u003e designed to be buried under substrate, invisible from above\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTall mangrove corner cave:\u003c\/strong\u003e visible above-substrate cave with mangrove-style pillars for vertical scape interest\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide corner cave:\u003c\/strong\u003e visible above-substrate cave with extra-large entrance for big-bodied fish like adult plecos and cichlids\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy buy from Blubber Cove\u003c\/h2\u003e\n\u003cp\u003eOriginal aquascaper-designed pieces, 3D-printed to order in our UK workshop in aquarium-safe PETG. No painted resin, no imports, no surprises. Free UK delivery over £30.\u003c\/p\u003e","brand":"Blubber Cove","offers":[{"title":"Black \/ Standard","offer_id":49803194204424,"sku":"","price":24.15,"currency_code":"GBP","in_stock":true},{"title":"Black \/ Large","offer_id":49803194237192,"sku":"","price":37.85,"currency_code":"GBP","in_stock":true},{"title":"White \/ Standard","offer_id":49803194269960,"sku":"","price":24.15,"currency_code":"GBP","in_stock":true},{"title":"White \/ Large","offer_id":49803194302728,"sku":"","price":37.85,"currency_code":"GBP","in_stock":true},{"title":"Marble Effect \/ Standard","offer_id":49803194335496,"sku":"","price":24.15,"currency_code":"GBP","in_stock":true},{"title":"Marble Effect \/ Large","offer_id":49803194368264,"sku":"","price":37.85,"currency_code":"GBP","in_stock":true},{"title":"Moss Green \/ Standard","offer_id":49803194401032,"sku":"","price":24.15,"currency_code":"GBP","in_stock":true},{"title":"Moss Green \/ Large","offer_id":49803194433800,"sku":"","price":37.85,"currency_code":"GBP","in_stock":true},{"title":"Sand \/ Standard","offer_id":49803194466568,"sku":"","price":24.15,"currency_code":"GBP","in_stock":true},{"title":"Sand \/ Large","offer_id":49803194499336,"sku":"","price":37.85,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0880\/7114\/3688\/files\/reptile-or-aquarium-natural-cave-corner-suitable-for-fish-tanks-salt-or-fresh-water-787679.jpg?v=1771496785","url":"https:\/\/www.getwarsplay.com\/products\/underground-aquarium-cave-bury-under-sand","provider":"WarSplay","version":"1.0","type":"link"}