{"product_id":"caulerpa-racemosa-macroalgae-reef-genetics","title":"Caulerpa Racemosa Macroalgae - Reef Genetics","description":"\u003c!-- topshelf-caulerpa-seo:v1 --\u003e\n\u003cp\u003e\u003cstrong\u003eCaulerpa racemosa macroalgae, commonly called Grape Caulerpa, forms bright green runners topped with bead-like branchlets.\u003c\/strong\u003e It creates dense texture, takes up dissolved nutrients as it grows, and offers surface area for pods and beneficial microbes. Unlike loose Chaeto, this Caulerpa anchors with rhizoids and can spread into rock or substrate, so it requires deliberate placement, frequent thinning, and responsible disposal.\u003c\/p\u003e\n\u003ch2\u003eCaulerpa Racemosa quick care facts\u003c\/h2\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eScientific name\u003c\/th\u003e\n\u003ctd\u003e\u003cem\u003eCaulerpa racemosa\u003c\/em\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCommon name\u003c\/th\u003e\n\u003ctd\u003eGrape Caulerpa \/ green grape algae\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eAlgae group\u003c\/th\u003e\n\u003ctd\u003eGreen macroalgae\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eCare level\u003c\/th\u003e\n\u003ctd\u003eEasy, with active pruning and containment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eLighting\u003c\/th\u003e\n\u003ctd\u003eHigh, white or full-spectrum\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eWater flow\u003c\/th\u003e\n\u003ctd\u003eModerate to high\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePlacement\u003c\/th\u003e\n\u003ctd\u003eContained refugium or carefully managed macroalgae display\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eGrowth form\u003c\/th\u003e\n\u003ctd\u003eCreeping stolons with upright grape-like branchlets\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003eGrowth rate\u003c\/th\u003e\n\u003ctd\u003eModerate to fast once established\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth scope=\"row\"\u003ePortion sizes\u003c\/th\u003e\n\u003ctd\u003eGolf Ball: 2–3 inches; Soft Ball: approximately 5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhy grow Caulerpa Racemosa?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDistinct grape-like form for planted refugiums and dedicated macroalgae displays.\u003c\/li\u003e\n\u003cli\u003eTakes up nitrate and phosphate during growth; harvesting physically exports those nutrients.\u003c\/li\u003e\n\u003cli\u003eProvides complex cover for copepods, amphipods, and other small refugium life.\u003c\/li\u003e\n\u003cli\u003eCan provide supplemental grazing for tangs and rabbitfish, although individual fish preferences vary.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eLighting, flow, and nutrients\u003c\/h2\u003e\n\u003cp\u003eUse strong white or full-spectrum refugium lighting and moderate-to-high flow that reaches through the patch without tearing it loose. Maintain measurable nitrate and phosphate rather than driving either nutrient abruptly to zero. Stable salinity and temperature matter. Trace or iron supplementation should be based on the whole system and product directions, never used as a substitute for testing.\u003c\/p\u003e\n\u003ch2\u003eRefugium or display tank?\u003c\/h2\u003e\n\u003cp\u003eA contained refugium is the safest placement because Racemosa sends creeping stolons and can regrow from small fragments. In a display, keep it on an isolated, removable substrate and away from coral rockwork, pumps, and overflows. Rhizoids can enter pores and make complete removal difficult. Herbivorous fish may control visible growth, but grazing is not a reliable containment plan.\u003c\/p\u003e\n\u003ch2\u003ePruning and nutrient export\u003c\/h2\u003e\n\u003cp\u003eNutrient export occurs only when growth leaves the aquarium. Thin the patch regularly, often weekly under fast growth, and remove complete runners or fronds near their base rather than shredding the colony in place. Leave enough healthy growth to recover. Catch every fragment with a net or mechanical filter, because broken pieces can establish elsewhere in the system.\u003c\/p\u003e\n\u003ch2\u003eTroubleshooting and sexual reproduction\u003c\/h2\u003e\n\u003cp\u003eAll Caulerpa can enter a sexual phase and die back, releasing stored material into the water. Racemosa deserves especially close observation. Warning signs can include paling or translucent tissue, patchy discoloration, fine projections, and sudden cloudiness. Remove suspect growth immediately, run fresh mechanical filtration, support oxygenation and skimming, and test water. Regular thinning and a stable photoperiod reduce risk but do not eliminate it.\u003c\/p\u003e\n\u003ch2\u003eHow Caulerpa Racemosa compares\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/products\/caulerpa-prolifera-macroalgae-reef-genetics\"\u003eCaulerpa Prolifera\u003c\/a\u003e grows flat blade-like fronds from a runner and creates a seagrass-style meadow. Racemosa is denser and more three-dimensional, with the signature grape form. \u003ca href=\"\/products\/pom-pom-gracilaria-macroalgae\"\u003ePom Pom Gracilaria\u003c\/a\u003e is a red ornamental macroalgae that does not root into substrate, making it easier to relocate when a display needs a less persistent option.\u003c\/p\u003e\n\u003ch2\u003ePortion sizes, acclimation, and responsible ownership\u003c\/h2\u003e\n\u003cp\u003eChoose a Golf Ball portion measuring roughly 2–3 inches or a Soft Ball portion around 5 inches. Temperature-acclimate the sealed bag, rinse in discarded tank water, inspect for unwanted hitchhikers, and start under reduced light before increasing intensity. Never release Caulerpa or aquarium water into a waterway. Check local law before ordering: California prohibits possession, sale, import, transport, and transfer of live Caulerpa.\u003c\/p\u003e\n\u003ch2\u003ePairs well with\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/products\/illumagic-pixel-refugium-dalua\"\u003eIllumagic Pixel Refugium Light\u003c\/a\u003e or \u003ca href=\"\/products\/h80-tuna-flora-refugium-led-light-kessil\"\u003eKessil H80 Tuna Flora Refugium Light\u003c\/a\u003e for dedicated lighting, \u003ca href=\"\/products\/nitrate-aquarium-test-kit-salifert\"\u003eSalifert Nitrate Test Kit\u003c\/a\u003e and \u003ca href=\"\/products\/phosphate-aquarium-test-kit-salifert\"\u003eSalifert Phosphate Test Kit\u003c\/a\u003e for nutrient tracking, \u003ca href=\"\/products\/live-mixed-copepods-tisbe-apocyclops-reef-genetics\"\u003eReef Genetics Mixed Copepods\u003c\/a\u003e for refugium biodiversity, and \u003ca href=\"\/products\/trace-colors-c-iron-trace-500-ml-red-sea\"\u003eRed Sea Trace Colors C\u003c\/a\u003e only when a tested trace-element strategy calls for it.\u003c\/p\u003e\n\u003c!-- \/topshelf-caulerpa-seo:v1 --\u003e","brand":"Top Shelf Aquatics","offers":[{"title":"Golf Ball","offer_id":52810542580010,"sku":null,"price":34.99,"currency_code":"USD","in_stock":true},{"title":"Soft Ball","offer_id":52810542612778,"sku":null,"price":49.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/0873\/7322\/files\/caluerpa-algae-for-sale.webp?v=1790889050","url":"https:\/\/topshelfaquatics.com\/products\/caulerpa-racemosa-macroalgae-reef-genetics","provider":"Top Shelf Aquatics","version":"1.0","type":"link"}