---
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: "R1251"
currency: ZAR
in_stock: true
category: "The Coral Ranch"
url: https://www.desertcart.co.za/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media
store_origin: ZA
region: South Africa
---

# 1 ml per liter dosing, ultra cost-effective 500 ml bulk size for heavy culture Proven F/2 formula since 1962 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:** R1251
**Availability:** ✅ In Stock

## Summary

> 🌊 Fuel your reef’s future with the ultimate microalgae boost!

## 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?** R1251 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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

- • **Academic-Grade Formula:** Trusted since 1962, the gold standard for marine microalgae culture.
- • **All-in-One Nutrient Mix:** Complete macro and trace elements combined in a single, ready-to-use concentrate.
- • **Made in the USA with Care:** Crafted in-house by The Coral Ranch for quality you can trust and repeatable results.
- • **Effortless Precision Dosing:** Just 1 ml per liter ensures consistent, clean nutrient delivery every time.
- • **Bulk Ready for Serious Breeders:** 500 ml bottle supports up to 125 gallons of culture media—perfect for hatcheries and reef pros.

## Overview

Guillard's F/2 Formula Microalgae Fertilizer Concentrate is a 500 ml ready-to-use liquid nutrient solution based on the proven academic F/2 recipe since 1962. Designed for marine microalgae cultures like Nannochloropsis and Tetraselmis, it supports copepods, rotifers, brine shrimp, and coral growth. With ultra-precise dosing at 1 ml per liter, this USA-made concentrate offers a cost-effective, all-in-one nutrient mix ideal for breeders, hatcheries, and serious reef hobbyists.

## 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

## 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 |
| ASIN  | B0CKM628G2 |
| Best Sellers Rank | #133,898 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,133 in Aquarium Water Treatments |
| Brand Name | The Coral Ranch |
| Customer Reviews | 3.7 3.7 out of 5 stars (47) |
| Date First Available  | August 13, 2023 |
| Included Components | Microalgae Fertilizer |
| Item Form | Liquid |
| Item Weight | 236 g |
| Item model number  | f/2 10 fl oz |
| Liquid Volume | 10 fluid ounces |
| Manufacturer | The Coral Ranch |
| 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 |
| Product Dimensions  | 2.2 x 2.2 x 9.5 inches; 8.32 ounces |
| 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)

## Available Options

This product comes in different **Size** options.

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- The Coral Ranch - Guillard's F/2 Formula Microalgae Fertilizer Concentrate (16.9 fl oz (500ml))
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**Shop now:** [https://www.desertcart.co.za/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media](https://www.desertcart.co.za/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-13*