---
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: "212.43 DT"
currency: TND
in_stock: true
category: "The Coral Ranch"
url: https://www.desertcart.tn/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media
store_origin: TN
region: Tunisia
---

# Feeds up to 125 gallons per bottle Proven 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:** 212.43 DT
**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?** 212.43 DT with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/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

- • **Crafted with Care in the USA:** Manufactured in-house with a dropper-friendly bottle for clean, repeatable feeding.
- • **Bulk Size for Serious Breeders:** 500ml bottle supports heavy culture work—perfect for hatcheries and reef pros.
- • **All-in-One Ready-to-Use Formula:** Complete macro and trace nutrients combined for instant mixing—no guesswork.
- • **Effortless, Cost-Effective Dosing:** Just 1ml per liter delivers maximum growth with minimal waste.
- • **Academic-Grade Microalgae Nutrition:** Trusted since 1962, the gold standard for marine microalgae culture.

## Overview

Guillard's F/2 Formula Microalgae Fertilizer Concentrate is a ready-to-use, scientifically validated culture media designed to optimize growth of marine microalgae like Nannochloropsis and Isochrysis. Ideal for reef tanks, hatcheries, and marine breeders, this 500ml bottle supports up to 125 gallons of culture with precise dosing. Made in the USA, it combines all essential macro and trace nutrients in a convenient liquid form, ensuring consistent, high-quality phytoplankton growth to feed copepods, rotifers, brine shrimp, and more.

## 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 | #101,542 in Pet Supplies ( See Top 100 in Pet Supplies ) #901 in Aquarium Water Treatments |
| Brand Name | The Coral Ranch |
| Customer Reviews | 3.6 3.6 out of 5 stars (45) |
| 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 |
| 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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**Shop now:** [https://www.desertcart.tn/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media](https://www.desertcart.tn/products/609108794-guillards-f-2-formula-microalgae-fertilizer-concentrate-phytoplankton-culture-media)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-08-13*