{"product_id":"seachem-flourite-black-3-5kg","title":"Seachem Flourite Black 3.5kg","description":"\u003cp\u003e\u003cstrong\u003eA substrate your plants can actually feed from, not just sit in.\u003c\/strong\u003e Seachem Flourite Black is a stable, porous clay gravel for freshwater planted aquariums. It isn't chemically coated or treated — the clay itself is soft enough that plant roots draw minerals directly from the grains, and because it's a natural mineral substrate rather than a nutrient-dosed one, it doesn't run out or need replacing.\u003c\/p\u003e\u003ch3\u003eKey features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePorous clay structure\u003c\/strong\u003e — plant roots extract minerals directly from the substrate rather than relying only on water-column dosing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot chemically coated\u003c\/strong\u003e — won't alter your water's pH.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNever needs replacing\u003c\/strong\u003e — good for the life of the aquarium, and compatible with undergravel filters without softening or breaking down.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUse alone or as a base layer\u003c\/strong\u003e under other substrates or hardscape.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eAttribute\u003c\/th\u003e\n\u003cth\u003eDetail\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eWeight\u003c\/td\u003e\n\u003ctd\u003e3.5 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eAA0420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBarcode\u003c\/td\u003e\n\u003ctd\u003e000116372305\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eColour\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoating\u003c\/td\u003e\n\u003ctd\u003eNone — uncoated, untreated clay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWater type\u003c\/td\u003e\n\u003ctd\u003eFreshwater\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch3\u003eWill it fit my tank?\u003c\/h3\u003e\u003cp\u003eSeachem doesn't publish a fixed coverage figure (litres or kilograms per square metre of tank floor) for this bag size — their own product page instead offers an online calculator that takes your tank's footprint and desired depth. As a starting point for planning, weigh up how many bags you'll need before ordering rather than guessing on one bag for a larger footprint; we're happy to help you work out quantities for your specific tank.\u003c\/p\u003e\u003ch3\u003ePreparation\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eFlourite Black is pre-washed at the factory, but can still be dusty after transit — rinse before use.\u003c\/li\u003e\n\u003cli\u003eFill the tank slowly once the substrate is in (the \"bowl method\" — pour water onto a bowl or plate sitting on the substrate) to avoid disturbing the bed.\u003c\/li\u003e\n\u003cli\u003eSome initial cloudiness is normal and clears through mechanical filtration, or faster with a water clarifier.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSuitable for, and not suitable for\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eSuitable for any freshwater planted aquarium.\u003c\/li\u003e\n\u003cli\u003eNot chemically coated, so it won't push your pH in any direction.\u003c\/li\u003e\n\u003cli\u003eNot marketed for marine or reef use — this is a freshwater planted-tank substrate.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCare and maintenance\u003c\/h3\u003e\u003cp\u003eNo replacement needed under normal use. Avoid excessive substrate disturbance once plants are established, and it will continue to work with an undergravel filter without softening or decomposing.\u003c\/p\u003e\u003ch3\u003eGoes well with\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachem-flourish-tabs\"\u003eSeachem Flourish Tabs\u003c\/a\u003e — root-zone fertiliser tabs pushed into the substrate.\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/seachem-flourish-trace\"\u003eSeachem Flourish Trace\u003c\/a\u003e and \u003ca href=\"\/products\/seachem-flourish-potassium\"\u003eSeachem Flourish Potassium\u003c\/a\u003e — water-column dosing to complement root feeding.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eWarranty and delivery\u003c\/h3\u003e\u003cp\u003eCovered by your rights under Australian Consumer Law in addition to any manufacturer guarantee. Ships Australia-wide from North Lakes, QLD.\u003c\/p\u003e\u003ch3\u003eCommon questions\u003c\/h3\u003e\u003ch4\u003eDoes it need rinsing before use?\u003c\/h4\u003e\u003cp\u003eYes — it's pre-washed at the factory but can pick up dust in transit, so rinse it before adding it to the tank.\u003c\/p\u003e\u003ch4\u003eWill it change my water's pH?\u003c\/h4\u003e\u003cp\u003eNo, it isn't chemically coated or treated, so it won't push pH in either direction.\u003c\/p\u003e\u003ch4\u003eHow much do I need for my tank?\u003c\/h4\u003e\u003cp\u003eSeachem doesn't publish a fixed coverage figure for this bag size — contact us with your tank's footprint and desired substrate depth and we'll help you work out how many 3.5 kg bags you need.\u003c\/p\u003e\u003ch4\u003eDoes it need replacing over time?\u003c\/h4\u003e\u003cp\u003eNo — it's a stable mineral substrate, not a nutrient dose, so it's good for the life of the aquarium.\u003c\/p\u003e\u003ch4\u003eCan I use it with an undergravel filter?\u003c\/h4\u003e\u003cp\u003eYes, Seachem states it works fine with undergravel filtration and won't soften or break down.\u003c\/p\u003e","brand":"Seachem","offers":[{"title":"Default Title","offer_id":55242272997667,"sku":"AA0420","price":46.95,"currency_code":"AUD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/7236\/5347\/files\/3723-flourite_black-3.5_kg-scaled-scaled.png?v=1782710632","url":"https:\/\/nicksaquariumoceanariumterrarium.com.au\/products\/seachem-flourite-black-3-5kg","provider":"Nicks Aquarium Oceanarium Terrarium","version":"1.0","type":"link"}