{"product_id":"cdx-carbon-dioxide-adsorption-media-750-ml-two-little-fishies","title":"CDX Carbon Dioxide Adsorption Media (750 ml) - Two Little Fishies","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eCDX Carbon Dioxide Adsorption Media — Two Little Fishies (750 mL)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eTransform Your Tank with Higher, More Stable pH\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eLooking for the secret weapon that fixes the low-pH problem most reefers don't even realize they have? CDX Carbon Dioxide Adsorption Media by Two Little Fishies is a clever, science-backed solution stocked at The Coral Boutique for serious reef keepers battling stubbornly low pH from indoor air CO2 buildup. If your reef pH won't climb past 8.0 no matter what you dose, CDX targets the actual cause instead of masking the symptom.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eCDX works by scrubbing CO2 out of the air being drawn into your protein skimmer. Closed homes, sealed offices, and tightly insulated buildings concentrate atmospheric CO2 — and every time your skimmer pulls that CO2-rich air through your tank, it drives pH down. Load CDX into a fluidized media reactor (Two Little Fishies' 150 or 550 PhosBan Reactor works perfectly), connect the reactor's outlet to your skimmer's air intake using the CDX Adaptor, and the skimmer instantly becomes a CO2-scrubbing engine. The CO2-free air entering the skimmer pulls dissolved CO2 out of your tank water, allowing pH to rise naturally to its proper range — no kalkwasser slurries, no two-part overdosing, no fragile pH buffering tricks. Best of all, CDX includes a built-in visual exhaustion indicator: the media starts white and turns pink\/violet as it depletes, so you always know exactly when to replace it. A 750 mL jar typically lasts 6–8 weeks on a 50–100 gallon reef aquarium.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"[li_\u0026amp;]:mb-0 [li_\u0026amp;]:mt-1 [li_\u0026amp;]:gap-1 [\u0026amp;:not(:last-child)_ul]:pb-1 [\u0026amp;:not(:last-child)_ol]:pb-1 list-disc flex flex-col gap-1 pl-8 mb-3\"\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eNaturally elevates and stabilizes aquarium pH at its true source\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eScrubs CO2 from skimmer intake air for a CO2-free injection into the water\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eSolves chronic low-pH issues caused by closed indoor environments\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eNo risk of overshooting or crashing pH like with chemical buffers\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eVisual color-change indicator (white → pink\/violet) signals when to replace\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eWorks with any fluidized media reactor — pairs perfectly with TLF PhosBan Reactors\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eReef-safe and chemistry-friendly — won't affect alkalinity, calcium, or magnesium\u003c\/li\u003e\n\u003cli class=\"whitespace-normal break-words pl-2\"\u003eIdeal for SPS-dominant systems where stable, elevated pH boosts coral growth\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eQuick Stats \u0026amp; Specs\u003c\/strong\u003e Product Name: CDX Carbon Dioxide Adsorption Media Manufacturer: Two Little Fishies Size: 750 mL Active Function: CO2 adsorption from skimmer intake air Form: Granular media (keep dry — do NOT wet with water) Treats: 50–100 gallons of reef aquarium volume per 750 mL Replacement Interval: Every 6–8 weeks (or when media turns from white to pink\/violet) Recommended Setup: Two Little Fishies 150 or 550 PhosBan Reactor (or any fluidized media reactor) + CDX Adaptor Compatibility: Saltwater, reef, and freshwater aquariums running an air-injecting protein skimmer Best For: Reef keepers with persistently low pH (below 8.0–8.1), indoor-located tanks, SPS-dominant systems benefitting from elevated pH Directions: Load CDX into a tall columnar fluidized reactor. Connect the reactor outlet to your skimmer's air intake using the CDX Adaptor or compatible barbed reducing fitting. Keep the supply container tightly sealed when not in use. Do not allow the media to get wet — CDX must stay dry to function.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eWhy Buy From The Coral Boutique?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAt The Coral Boutique, we stock only the equipment and additives we trust on our own systems. CDX is one of those clever-but-overlooked products that solves a real problem for serious reefers — the kind of tool that turns a frustrating, chronic pH issue into a non-issue. If you've been chasing pH stability with no luck, CDX is the upgrade that fixes the cause. Every product on our shelves is tested, vetted, and backed by reefers who actually use it — so you can buy with confidence.\u003c\/p\u003e","brand":"The Coral Boutique","offers":[{"title":"Default Title","offer_id":54113015202067,"sku":null,"price":23.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0954\/3647\/2595\/files\/CDXCarbonDioxideAdsorptionMedia_750ml_-TwoLittleFishies.webp?v=1777949695","url":"https:\/\/thecoralboutique.com\/products\/cdx-carbon-dioxide-adsorption-media-750-ml-two-little-fishies","provider":"The Coral Boutique","version":"1.0","type":"link"}