{"product_id":"api-ph-down-4-fl-oz","title":"API pH Down 4 fl oz — Nano pH Acidifier for Freshwater Aquariums - API","description":"\u003ch2\u003eAPI pH Down 4 fl oz — nano pH acidifier for small aquariums\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eAPI pH Down 4 fl oz\u003c\/strong\u003e is the nano format of the API pH acidifier, sized for small freshwater aquariums (nano tetras, discus, Amazon fish). Lowers pH gradually per the dosing chart on the bottle.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eBrand: API\u003c\/li\u003e\n\u003cli\u003eFormat: 4 fl oz (118 ml)\u003c\/li\u003e\n\u003cli\u003eType: liquid pH acidifier\u003c\/li\u003e\n\u003cli\u003eCompatibility: small freshwater aquariums\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eHow to use\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDose per the bottle chart (typically 1 ml per 5 US gal).\u003c\/li\u003e\n\u003cli\u003eWait 24 h and retest before the second dose.\u003c\/li\u003e\n\u003cli\u003eNever drop pH more than 0.2 points in 24 h to avoid stressing fish.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhy get this from ReefSolution\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ca href=\"\/en\/products\/ph-down-16-fl-oz\"\u003eAPI pH Down 16 fl oz\u003c\/a\u003e\u003c\/strong\u003e — standard size for larger tanks.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ca href=\"\/en\/products\/api-ph-test-kit-freshwater\"\u003eAPI Freshwater pH Test Kit\u003c\/a\u003e\u003c\/strong\u003e — monitor during adjustment.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e\u003ca href=\"\/en\/products\/ph-up-4-fl-oz\"\u003eAPI pH Up 4 fl oz\u003c\/a\u003e\u003c\/strong\u003e — nano raiser for the opposite.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eFrequently asked questions\u003c\/h2\u003e\n\u003ch3\u003eWhat aquarium size does this nano format cover?\u003c\/h3\u003e\n\u003cp\u003eUp to about 40 L — beyond that, the 16 fl oz size is more economical.\u003c\/p\u003e\n\u003ch3\u003eCan I use API pH Down on a reef aquarium?\u003c\/h3\u003e\n\u003cp\u003eNo — this is a freshwater adjuster. On a reef marine tank, use controlled CO₂ or kalkwasser to adjust pH.\u003c\/p\u003e","brand":"API","offers":[{"title":"Default Title","offer_id":45100045140139,"sku":"2354","price":9.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0513\/7108\/1899\/files\/2354.jpg?v=1743959978","url":"https:\/\/reefsolution.com\/en\/products\/api-ph-down-4-fl-oz","provider":"Aquarium ReefSolution inc.","version":"1.0","type":"link"}