---
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: "38657CFA"
currency: XOF
in_stock: true
reviews_count: 8
category: "The Coral Ranch"
url: https://www.desertcart.sn/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media
store_origin: SN
region: Senegal
---

# 500 ml feeds 125 gallons culture Classic F/2 formula since 1962 Made in USA, precision dosing 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:** 38657CFA
**Availability:** ✅ In Stock

## Summary

> 🌊 Fuel your reef’s microalgae growth with the gold standard in marine culture media!

## 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?** 38657CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/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 ready-to-use concentrate—no mixing guesswork required.
- • **Academically Proven Formula:** Trusted marine microalgae culture recipe refined since 1962 for consistent, reliable growth.
- • **Crafted with Care in the USA:** Manufactured in-house by The Coral Ranch, ensuring quality control and clean, repeatable dosing every time.
- • **Bulk Size for Serious Cultivators:** Generous 16.9 fl oz bottle supports large-scale cultures—perfect for breeders, hatcheries, and reef pros.
- • **Effortless, Cost-Effective Dosing:** Just 1 ml per liter of seawater delivers optimal nutrients, maximizing value with minimal effort.

## Overview

Guillard's F/2 Formula Microalgae Fertilizer Concentrate is a ready-to-use, scientifically validated nutrient solution designed to cultivate marine microalgae such as Nannochloropsis and Tetraselmis. Packaged in a 16.9 fl oz bottle, it supports up to 125 gallons of culture media, making it ideal for professional breeders, hatcheries, and dedicated reef hobbyists. Manufactured in the USA by The Coral Ranch, this formula combines all essential macro and trace nutrients for efficient, cost-effective dosing and consistent phytoplankton growth.

## 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: 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 | #119,804 in Pet Supplies ( See Top 100 in Pet Supplies ) #1,051 in Aquarium Water Treatments |
| Brand | The Coral Ranch |
| Brand Name | The Coral Ranch |
| Customer Reviews | 3.7 out of 5 stars 43 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)

## 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 Senegal*
*Store origin: SN*
*Last updated: 2026-07-08*