---
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: "1579379₫"
currency: VND
in_stock: true
reviews_count: 8
category: "The Coral Ranch"
url: https://www.desertcart.vn/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media
store_origin: VN
region: Vietnam
---

# High-density cultures 500ml concentrate Made in the USA 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:** 1579379₫
**Availability:** ✅ In Stock

## Summary

> 🌿 Grow Green, Live Clean!

## 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?** 1579379₫ with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/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

- • **Concentrated Formula:** A potent 16.9 fl oz (500ml) concentrate that delivers maximum results with minimal effort.
- • **Unlock Nature's Power:** Harness the benefits of high-density phytoplankton cultures for vibrant plant growth.
- • **Versatile Application:** Ideal for indoor and outdoor plants, ensuring lush greenery wherever you grow.
- • **Eco-Friendly Innovation:** Sustainably sourced and manufactured in the USA, perfect for the conscious gardener.
- • **Join the Green Revolution:** Elevate your gardening game and connect with a community of eco-conscious enthusiasts.

## Overview

Guillard's F/2 Formula Microalgae Fertilizer Concentrate is a high-density phytoplankton fertilizer manufactured in the USA, designed to enhance plant growth with its concentrated 16.9 fl oz (500ml) formula. Perfect for eco-friendly gardening enthusiasts looking to boost their plant health sustainably.

## Description

Product description The Coral Ranch F/2 Guillard’s Formula Microalgae Fertilizer Concentrate The Coral Ranch's F/2 Microalgae nutrient solution is specially formulated to foster the healthy phytoplankton. Using Guillard's proven formula. Derived from high-quality ingredients, this fertilizer provides the essential nutrients, vitamins and trace elements necessary for robust phytoplankton cultures. The Coral Ranch’s F/2 Microalgae Fertilizer is your reliable choice for achieving high density phytoplankton cultures. Directions Add 4ml per us gallon of freshly mixed saltwater to achieve f/2 concentration. Shake well before using. Storage Store in a cool, dry place away from direct sunlight. Benefits Guillard's F/2 Formula Leak proof sealed bottle Phytoplankton Fertilizer Manufactured in the USA High density Phytoplankton Cultures

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: Failed to grow culture - I originally ordered this product for my nannochlropsis culture in a 1g Poseidon reef systems phyto jars. These jars are sold SPECIFICALLY to grow copepods and different kinds of phyto. I tried adjusting light intensity, amount of bubbles, time the light was on, everything… and still no success. Which is strange because I have had success growing phyto in the past in these very same jars. The only thing I had changed was the fertilizer. I am almost up to 3x the recommended dose in a 1g container and am now to the point where my culture is just crashing. This product is extremely ineffective, and I would not purchase it or recommend t for the purpose of fertilizing phytoplankton cultures.

## 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 | #95,989 in Pet Supplies ( See Top 100 in Pet Supplies ) #886 in Aquarium Water Treatments |
| Brand | The Coral Ranch |
| Brand Name | The Coral Ranch |
| Customer Reviews | 3.7 out of 5 stars 44 Reviews |
| Included Components | Microalgae Fertilizer |
| Item Form | Liquid |
| Item Weight | 236 Grams |
| Liquid Volume | 10 Fluid Ounces |
| Manufacturer | The Coral Ranch |
| Manufacturer Part Number | 1 |
| Model Number | f/2 10 fl oz |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Aquatic Plants, Invertebrates |
| UPC | 197644137695 |
| Unit Count | 16.90 Fluid Ounces |
| Warranty Description | 30 days |

## Product Details

- **Brand:** The Coral Ranch
- **Liquid Volume:** 10 Fluid Ounces
- **Item Weight:** 236 Grams
- **Item Form:** Liquid
- **Manufacturer:** The Coral Ranch

## 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.

### ⭐ Failed to grow culture
*by A***R on December 10, 2025*

I originally ordered this product for my nannochlropsis culture in a 1g Poseidon reef systems phyto jars. These jars are sold SPECIFICALLY to grow copepods and different kinds of phyto. I tried adjusting light intensity, amount of bubbles, time the light was on, everything… and still no success. Which is strange because I have had success growing phyto in the past in these very same jars. The only thing I had changed was the fertilizer. I am almost up to 3x the recommended dose in a 1g container and am now to the point where my culture is just crashing. This product is extremely ineffective, and I would not purchase it or recommend t for the purpose of fertilizing phytoplankton cultures.

### ⭐⭐⭐⭐⭐ 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.

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*Product available on Desertcart Vietnam*
*Store origin: VN*
*Last updated: 2026-05-22*