{"product_id":"seachem-onyx-sand","title":"Seachem Onyx Sand","description":"\u003cp\u003eCreate a stunning, natural foundation for your freshwater tank with \u003cb\u003eSeachem Onyx Sand\u003c\/b\u003e. This premium, dark-grey natural substrate is specially crafted to support rooted aquatic plants while delivering a sophisticated aesthetic to your aquarium landscape. Rich in essential minerals like iron, manganese, and magnesium, Onyx Sand provides long-term nutrient availability without needing chemical replacement. Its fine grain structure makes it ideal for bottom-dwelling species and delicate root systems, offering a slight buffering capacity that helps stabilize pH in planted tanks.\u003c\/p\u003e\n\u003ch3\u003eQuick Reference \u0026amp; Requirements Table\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRequirement \/ Specification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eDetails\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eAvailable Bag Sizes\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e3.5 kg (7.7 lbs) and 7 kg (15.4 lbs)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eSubstrate Type\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePorous natural mineral sand \/ gravel mixture\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eTarget Aquariums\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eFreshwater planted, Cichlid, and community aquariums\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eColor Profile\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDeep charcoal to dark grey\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eWater Chemistry Impact\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSlightly raises carbonate hardness (KH) and buffers pH\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eLifespan\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003ePermanent substrate (no need to replace over time)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Seachem","offers":[{"title":"Onyx Sand 3.5 kg","offer_id":56742080086356,"sku":"FB3503","price":24.63,"currency_code":"EUR","in_stock":true},{"title":"Onyx Sand 7 kg","offer_id":56742080119124,"sku":"FB3504","price":40.74,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1052\/5828\/7444\/files\/onyx-sand.jpg?v=1786266257","url":"https:\/\/www.tropicalmarineaquatic.com\/products\/seachem-onyx-sand","provider":"Tropical Marine Aquatic","version":"1.0","type":"link"}