--- product_id: 739850214 title: "F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health*" brand: "aqua algae" price: "€ 72.01" currency: EUR in_stock: true reviews_count: 6 category: "Aqua Algae" url: https://www.desertcart.hr/products/739850214-f2-ferts-8oz-concentrated-guillards-f-2-formula-for-phytoplankton store_origin: HR region: Croatia --- # feeds 230+ liters of culture scientifically proven Guillard's F/2 8oz ultra-concentrated formula F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* **Brand:** aqua algae **Price:** € 72.01 **Availability:** ✅ In Stock ## Summary > 🌿 Cultivate the Future of Reef Health—Grow Your Own Microalgae Powerhouse! ## Quick Answers - **What is this?** F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* by aqua algae - **How much does it cost?** € 72.01 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/739850214-f2-ferts-8oz-concentrated-guillards-f-2-formula-for-phytoplankton) ## Best For - aqua algae enthusiasts ## Why This Product - Trusted aqua algae brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Reef-Safe & Silicate-Free:** Pure lab-grade ingredients ensure no harmful diatom blooms—safe for all reef inhabitants when used as directed. - • **Scientifically Backed Formula:** Based on the professional Guillard's F/2 standard, packed with essential vitamins and trace minerals for explosive algae growth. - • **Beginner-Friendly & Hassle-Free:** Simple dosing instructions and easy mixing make cultivating phytoplankton accessible for every reef enthusiast. - • **Economical & Ultra-Concentrated:** One 8oz bottle creates over 230 liters of culture medium—maximizing value and minimizing waste. - • **Grow Your Own Endless 'Pod' Food:** Stop overpaying—cultivate nutrient-rich phytoplankton at home to fuel thriving copepods and corals. ## Overview F2 Ferts (8oz) is a concentrated, silicate-free Guillard's F/2 formula designed for professional-grade phytoplankton cultivation. Ideal for marine microalgae like Nannochloropsis and Tetraselmis, it supports reef tank vitality by providing essential nutrients and vitamins. One bottle yields over 230 liters of culture medium, offering an economical, reef-safe solution to sustainably grow live microalgae that boost copepod and coral health. ## Description Product description Aqua Algae Guillard’s F/2 Formula is a concentrated phytoplankton culture fertilizer formulated for preparing marine microalgae culture medium. This solution is intended for use when culturing marine phytoplankton strains such as Nannochloropsis and Tetraselmis, and is designed to be mixed with prepared saltwater as part of a separate culture setup. Product Specifications: Based on the standard Guillard’s F/2 formulation and contains vitamins B1, B12, biotin, and trace minerals used in phytoplankton culture. Silicate-free composition. At the suggested mixing rate, one 16 fl oz bottle prepares approximately 473 liters, or about 125 gallons, of culture medium. Suggested Use: 1. Add 1 mL of F/2 formula per 1 liter of prepared saltwater. Recommended specific gravity: 1.019. 2. Introduce your phytoplankton starter culture. 3. Provide illumination for 16 to 24 hours per day with gentle aeration. 4. Monitor culture development and harvest according to your standard phytoplankton culture routine. Culture timing may vary. Storage: Shake well before each use. Store in a cool, dark location. For marine aquarium phytoplankton cultivation use. Directions Simply add 1 ml to 1 L (2 ml to a 2 L pop bottle) of fresh saltwater at ~1.019 s.g., add your starter culture and light ~16 hours per day. A 8 oz bottle is enough for approximately 240 liters at f/2 concentration! Keep in a cool, dark area and shake prior to use. Review: Tony - Very good for making green water. 1ml for every 1litre of fish tank water. Review: Stands up to thousands of reviews as best microalgae fertilizer - Great value! Only need 1 ml per liter! Can make 1000 liters of growth solution per bottle when mixed with filtered water. Odorless. High quality/easy to use. It is used to grow quality, healthy, vibrant strains of almost any type of algae or phytoplankton for science projects or climate research. Very useful! Personally, I am usually a critic before a proponent of the products I buy. But this fertilizer lived up to the claims. I use it to grow a few different species of algae, which I then use to add nitrogen to my compost bin. I also have a reef tank with wild grown live rock (which has to my knowledge, hundreds of different organisms that live attached or inside the rock). To keep them healthy, they need a steady supply of phytoplankton and certain algae. The live rock is over 2 years old and all the filter feeders, fans, and barnacles are still going strong! ## Features - GROW YOUR OWN "POD" FOOD: Stop overpaying for small, short-lived bottles of phytoplankton. Our concentrated F/2 formula is the secret to easily growing your own endless, nutrient-dense supply of live microalgae to feed your copepods, rotifers, and corals. - ULTRA-CONCENTRATED 8oz BOTTLE: A little goes a long way. This 8oz (236mL) bottle is enough to make over 230 liters (60+ gallons) of full-strength culture medium. It's the most economical way to support a thriving reef ecosystem. - THE PROFESSIONAL STANDARD (GUIL-LARD'S F/2): Don't guess with your fertilizer. Our solution is based on the scientifically proven Guillard's F/2 formula, containing all essential macronutrients, trace minerals, and vitamins (B1, B12, Biotin) for explosive algae growth. - SILICATE-FREE & REEF SAFE: Brewed with pure, lab-grade ingredients. This formula is 100% silicate-free, so it won't trigger a diatom (brown algae) bloom in your display tank. It's completely safe for all reef inhabitants when used as directed. - EASY TO USE FOR BEGINNERS: Includes clear, simple instructions. Just add 1mL per 1 Liter (or 2mL to a standard 2L pop bottle) of new saltwater, add your starter culture, and provide light. Shake well before each use. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B08ZYGBGPQ | | Best Sellers Rank | 55,053 in Pet Supplies ( See Top 100 in Pet Supplies ) 959 in Fish Food | | Brand | Aqua Algae | | Brand Name | Aqua Algae | | Customer Reviews | 4.7 out of 5 stars 94 Reviews | | Item Form | Liquid | | Item form | Liquid | | Liquid Volume | 8 Fluid Ounces | | Liquid volume | 8 Fluid Ounces | | Manufacturer | Aqua Algae | | Pet Type | Fish | | Target Species | Fish, Marine Invertebrates | | UPC | 661317842068 | | Unit Count | 226.7 gram | | Unit count | 226.7 gram | ## Product Details - **Brand:** Aqua Algae - **Item form:** Liquid - **Liquid volume:** 8 Fluid Ounces - **Manufacturer:** Aqua Algae - **Unit count:** 226.7 gram ## Images ![F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* - Image 1](https://m.media-amazon.com/images/I/51j7a1wKp4L.jpg) ![F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* - Image 2](https://m.media-amazon.com/images/I/61RZ3rJF-SL.jpg) ![F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* - Image 3](https://m.media-amazon.com/images/I/71UM-IUEbKL.jpg) ![F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* - Image 4](https://m.media-amazon.com/images/I/519-3CsH3DL.jpg) ![F2 Ferts (8oz) – Concentrated Guillard's F/2 Formula for Phytoplankton Culture - Professional Algae Fertilizer for Nannochloropsis & Tetraselmis - Boosts Copepod & Reef Tank Health* - Image 5](https://m.media-amazon.com/images/I/614XkApLWgL.jpg) ## Questions & Answers **Q: Is it safe for reef aquariums?** A: Yes, when used as directed for phytoplankton culture. Not intended for direct addition to aquariums. **Q: Does this product contain live phytoplankton?** A: No. This product is a concentrated formula for culturing phytoplankton. It does not contain live phytoplankton. **Q: What type of lighting is recommended?** A: Provide bright illumination for 16-24 hours per day. LED or grow lights work well. **Q: How should I store it?** A: Store in a cool, dark location. Keep tightly closed. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Tony *by T***R on 6 April 2026* Very good for making green water. 1ml for every 1litre of fish tank water. ### ⭐⭐⭐⭐⭐ Stands up to thousands of reviews as best microalgae fertilizer *by M***A on 2 October 2024* Great value! Only need 1 ml per liter! Can make 1000 liters of growth solution per bottle when mixed with filtered water. Odorless. High quality/easy to use. It is used to grow quality, healthy, vibrant strains of almost any type of algae or phytoplankton for science projects or climate research. Very useful! Personally, I am usually a critic before a proponent of the products I buy. But this fertilizer lived up to the claims. I use it to grow a few different species of algae, which I then use to add nitrogen to my compost bin. I also have a reef tank with wild grown live rock (which has to my knowledge, hundreds of different organisms that live attached or inside the rock). To keep them healthy, they need a steady supply of phytoplankton and certain algae. The live rock is over 2 years old and all the filter feeders, fans, and barnacles are still going strong! ### ⭐⭐⭐⭐⭐ Works *by H***H on 21 June 2026* I bought this fertilizer to grow a culture of Tetra. I usually run about 4 different containers at once to equal about 5 gallons total of phyto. I put about 3 mL in each container on day 1. I also add about another 1.5 mL on day 5. I typically harvest on day 7-10 and the culture gets very dark. I have no complaints about this fertilizer and it works just as well as some other more expensive brands. I'm not even halfway through the bottle yet and I have harvested more phyto than I can use for my 300gal reef tank. ## Frequently Bought Together - Aqua Algae 8oz Concentrated Guillard's F2 Formula - uxcell 2pcs Clear Rigid Tubing 18mm(11/16'') ID x 20mm(3/4'') OD x 1Ft Length Round Plastic Polycarbonate Tube --- ## 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.hr/products/739850214-f2-ferts-8oz-concentrated-guillards-f-2-formula-for-phytoplankton](https://www.desertcart.hr/products/739850214-f2-ferts-8oz-concentrated-guillards-f-2-formula-for-phytoplankton) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-08-01*