--- product_id: 609108794 title: "Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml)" brand: "the coral ranch" price: "¥10701" currency: JPY in_stock: true reviews_count: 8 category: "The Coral Ranch" url: https://www.desertcart.jp/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media store_origin: JP region: Japan --- # Feeds up to 125 gallons per bottle Proven F/2 formula since 1962 Made in USA, premium quality Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) **Brand:** the coral ranch **Price:** ¥10701 **Availability:** ✅ In Stock ## Summary > 🌿 Fuel your reef’s future with the gold standard in microalgae culture! ## Quick Answers - **What is this?** Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) by the coral ranch - **How much does it cost?** ¥10701 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media) ## Best For - the coral ranch enthusiasts ## Why This Product - Trusted the coral ranch brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **All-in-One Nutrient Blend:** Complete macro and trace elements combined in a single, ready-to-use concentrate. - • **Effortless Precision Dosing:** Just 1ml per liter ensures cost-effective, consistent culture media preparation. - • **Crafted with Care in the USA:** Manufactured in-house by The Coral Ranch for reliable quality and clean dosing. - • **Bulk-Ready for Serious Cultures:** Generous 500ml size supports heavy-duty breeding and reef tank ecosystems. - • **Academic-Grade Microalgae Nutrition:** Trusted F/2 formula perfected since 1962 for optimal phytoplankton growth. ## Overview Guillard's F/2 Formula Microalgae Fertilizer Concentrate is a scientifically validated, ready-to-use nutrient solution designed to cultivate marine microalgae such as Nannochloropsis and Tetraselmis. Ideal for reef tanks, copepods, rotifers, and brine shrimp, this 500ml bottle supports up to 125 gallons of culture media. Made in the USA by The Coral Ranch, it offers precise dosing and a complete nutrient profile trusted by breeders and serious hobbyists since 1962. ## Description Buy The Coral Ranch Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml): Aquarium Water Treatments - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Gives you dark green algae growth. - This product really helped my algae take off in growth. I have really dark algae that I feed my corals and copapods. Review: SKIP and Get Another Brand - Kept crashing my culture. Couldn't get it to work with 25%, 50% 100%, 150% or 200% dosage recommendations. Used another brand and had no issues. ## Features - PROVEN GUILLARD'S F/2 RECIPE — The academic standard for marine microalgae culture since 1962, supplied as a single ready-to-use concentrate. - BULK SIZE FOR HEAVY CULTURE WORK — Cultures Nannochloropsis, Tetraselmis, Isochrysis and other marine microalgae used to feed copepods, rotifers, brine shrimp, SPS corals, clams, and larval marine fish; sized for breeders, hatcheries, and serious reef hobbyists. - EASY DOSING, LOWEST COST PER LITER — Add 1 ml per liter (≈ 4 ml per gallon) of freshly mixed seawater. One 16.9 fl oz (500 ml) bottle fertilizes about 500 liters / 125 gallons of culture media. - MIXED, MEASURED, READY TO USE — Complete F/2 formulation with macro and trace nutrients combined in a single bottle; just dilute with seawater. - MANUFACTURED IN-HOUSE BY THE CORAL RANCH — Made in the USA at our own facility; sealed dropper-friendly bottle for clean, repeatable dosing. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0CKM628G2 | | Best Sellers Rank | #94,464 in Pet Supplies ( See Top 100 in Pet Supplies ) #802 in Aquarium Water Treatments | | Brand | The Coral Ranch | | Brand Name | The Coral Ranch | | Customer Reviews | 3.6 out of 5 stars 45 Reviews | | Included Components | Microalgae Fertilizer | | Item Form | Liquid | | Item Weight | 236 g | | Liquid Volume | 10 fluid ounces | | Manufacturer | The Coral Ranch | | Manufacturer Part Number | 1 | | Model Number | f/2 10 fl oz | | Number of Items | 1 | | Number of Packs | 1 | | Pet Type | Fish | | Target Species | Aquatic Plants, Invertebrates | | UPC | 197644137695 | | Unit Count | 16.9 Fluid Ounces | | Warranty Description | 30 days | ## Product Details - **Brand:** The Coral Ranch - **Item Form:** Liquid - **Item Weight:** 236 g - **Liquid Volume:** 10 fluid ounces - **Number of Packs:** 1 ## Images ![Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) - Image 1](https://m.media-amazon.com/images/I/518agEUXGPL.jpg) ![Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) - Image 2](https://m.media-amazon.com/images/I/51vwIcuxAkL.jpg) ![Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) - Image 3](https://m.media-amazon.com/images/I/61DYoQfXdqL.jpg) ![Guillard's F/2 Formula Microalgae Fertilizer Concentrate — Phytoplankton Culture Media for Reef Tank, Copepods, Rotifers, Brine Shrimp Food | Made in USA | 16.9 fl oz (500ml) - Image 4](https://m.media-amazon.com/images/I/617aGkkRw7L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Gives you dark green algae growth. *by R***V on February 13, 2025* This product really helped my algae take off in growth. I have really dark algae that I feed my corals and copapods. ### ⭐ SKIP and Get Another Brand *by T***E on July 6, 2026* Kept crashing my culture. Couldn't get it to work with 25%, 50% 100%, 150% or 200% dosage recommendations. Used another brand and had no issues. ### ⭐⭐⭐⭐⭐ It works growing phyto plankton with it. *by C***Y on July 12, 2024* Also cheap. It doesn't last long though so get a small bottle. ## Frequently Bought Together - The Coral Ranch - Guillard's F/2 Formula Microalgae Fertilizer Concentrate (16.9 fl oz (500ml)) - uxcell Clear Rigid Tubing 5mm(3/16'') ID x 6mm(1/4'') OD x 1Ft Length Round Plastic Polycarbonate Tube - North Mountain Supply 1 Gallon Glass Jar Wide Mouth with Black Plastic Lid - USDA, BPA-Free, Made in the USA - for Fermenting, Storing, Canning, and Much More! --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media](https://www.desertcart.jp/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-08-23*