---
product_id: 12404889
title: "Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L"
brand: "seachem"
price: "NT$7522"
currency: TWD
in_stock: true
reviews_count: 11
category: "Seachem"
url: https://www.desertcart.tw/products/12404889-flourish-excel-bioavailable-carbon-organic-carbon-source-for-aquatic-plants
store_origin: TW
region: Taiwan
---

# 4L organic carbon boost iron-reducing ferrous support bioavailable carbon formula Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L

**Brand:** seachem
**Price:** NT$7522
**Availability:** ✅ In Stock

## Summary

> 🌱 Elevate your aquatic garden with the ultimate carbon boost—grow smarter, not harder!

## Quick Answers

- **What is this?** Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L by seachem
- **How much does it cost?** NT$7522 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/12404889-flourish-excel-bioavailable-carbon-organic-carbon-source-for-aquatic-plants)

## Best For

- seachem enthusiasts

## Why This Product

- Trusted seachem brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Algae Control Edge:** Clinically proven to reduce stubborn black hair algae—double dose for max effect.
- • **Instant Carbon Power:** Bypasses CO2 complexity with ready-to-use organic carbon for thriving aquatic plants.
- • **Safe & Fish-Friendly:** 100% safe for all fish species, including sensitive tanks with Anacharis when dosed properly.
- • **Iron Boost for Growth:** Promotes ferrous iron (Fe+2) uptake, enhancing nutrient absorption and vibrant plant health.
- • **Economical Large Volume:** 4L size ensures long-lasting supply for large tanks, saving you frequent restocks and hassle.

## Overview

Seachem Flourish Excel 4L is a premium bioavailable organic carbon source designed to enhance aquatic plant photosynthesis by providing structurally similar carbon compounds that bypass CO2 dependency. It also promotes the ferrous state of iron (Fe+2) for better nutrient uptake, supports algae control, and is safe for all fish species. Ideal for large tanks, it offers an efficient, easy-to-dose solution for vibrant, healthy aquatic plants without the risks of CO2 injection.

## Description

Flourish Excel™ is a source of bioavailable organic carbon. All plants require a source of carbon. This is typically obtained from CO2, but, may also be derived from simple organic compounds (such as photosynthetic intermediates). The use of either CO2 injection or Flourish Excel™ does not necessarily negate the use of the other. Because the processes of producing photosynthetic intermediates and building onto them occur simultaneously, one can derive a substantial benefit with the use of Flourish Excel™ either alone or in conjunction with CO2 . The combination is particularly ideal for situations when continuing to add CO2 could result in dangerously low pH levels. Flourish Excel™ also has iron reducing properties which promote the ferrous state of iron (Fe+2), which is more easily utilized by plants than ferric iron (Fe+3). The reason plants need CO2 is to produce longer chain carbon compounds also known as photosynthetic intermediates. Photosynthetic intermediates includes compounds such as ribulose 1,5-bisphosphate, and 2-carboxy-3-keto-D-arabinitol 1,5 bisphosphate. Although the names are complicated, the structures are quite simple (5 carbon chains). Flourish Excel™ does not contain these specific compounds per se, but one that is quite similar. By dosing with Flourish Excel™ you bypass the involvement of CO2 and introduce the already finished, structurally similar compounds. It is in its structural similarity that Flourish Excel™ is able to be utilized in the carbon chain building process of photosynthesis. Simple chemical or enzymatic steps can easily convert it to any one to any one of the above named compounds (or a variety of others).

Review: Works well vs hair algae - This is about the only stuff I've found that kills black hair algae. You have to double dose it but it works. Plants thrive while dosing this.
Review: Great size for dosing larger tanks - Flourish Excel is a great product for keeping algae levels low and helping growth rate in your plants. If you can't afford or are nervous about injected CO2, this is a good middle step between low tech and high tech. I bought this for my 75 gallon planted tank a few months ago and still haven't needed to restock, even though I've been dosing it as directed daily plus during weekly 50% water changes. Definitely worth the investment over constantly buying containers a quarter this size through my local fish store.

## Features

- CARBON PRODUCTION: All plants require a source of carbon, and Flourish Excel is a great and convenient source of bioavailable organic carbon.
- IRON PRODUCTION: Flourish Excel also possesses iron reducing properties, thus promoting the ferrous state of iron (Fe+2), which is more easily utilized by plants than ferric iron (Fe+3).
- PHOTOSYNTHESIS: Plants must produce longer chain carbon compounds (photosynthetic intermediates). By dosing with Flourish Excel you bypass the involvement of chain carbon compounds and introduce the already finished, structurally similar compounds.
- TREATMENT: On initial use or after a major (> 40%) water change, use 1 capful of Flourish Excel (5 mL) for every 40 L (10 US gallons). Thereafter, use 1 capful for every 200 L (50 US gallons) daily or every other day. For smaller dosing please note that each cap thread is approximately 1 mL.
- SAFETY: Flourish Excel is completely safe for fish, however, if you have Anacharis in an aquarium in which you are dosing Flourish Excel, then it is recommended to use it every other day rather than daily.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002A5WRE |
| ASIN  | B0002A5WRE |
| Age Range Description | All Life Stages |
| Best Sellers Rank | #53,174 in Pet Supplies ( See Top 100 in Pet Supplies ) #528 in Aquarium Water Treatments |
| Brand Name | Seachem |
| Breed Recommendation | Small Breeds |
| Color | clear |
| Customer Reviews | 4.7 4.7 out of 5 stars (145) |
| Date First Available | April 8, 2008 |
| Date First Available  | April 8, 2008 |
| Directions | On initial use or after a major (> 40%) water change, use 1 capful (5 mL) for every 40 L (10 US gallons). Thereafter use 1 capful for every 200 L (50 US gallons) daily or every other day. For smaller dosing please note that each cap thread is approximately 1 mL. |
| Included Components | Liquid |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 4.5 x 6.88 x 11.5 inches |
| Item Package Dimensions L x W x H | 12.24 x 6.06 x 6.06 inches |
| Item Weight | 2 Pounds |
| Item model number | 459 |
| Item model number  | 459 |
| Manufacturer | Seachem Laboratories, Inc. |
| Manufacturer  | Seachem Laboratories, Inc. |
| Material | cotton |
| Model Name | Seachem Flourish Excel 4L |
| Number of Items | 1 |
| Product Dimensions  | 4.5 x 6.88 x 11.5 inches; 2 Pounds |
| Size | 4 L/ 1 fl. gallon |
| Specific Uses for Product | Active |
| Target Audience Keyword | fish;algae-eaters; betta-fish; bottom-feeder-fish; cichlid-fish; goldfish; invertebrate-fish; mollusks; octopuses; rays; sharks; snails |

## Product Details

- **Brand:** Seachem
- **Item Form:** Liquid
- **Item Weight:** 2 Pounds
- **Liquid Volume:** 4 Liters
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L - Image 1](https://m.media-amazon.com/images/I/61FVPUYjybL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well vs hair algae
*by K***1 on January 20, 2026*

This is about the only stuff I've found that kills black hair algae. You have to double dose it but it works. Plants thrive while dosing this.

### ⭐⭐⭐⭐⭐ Great size for dosing larger tanks
*by K***N on March 17, 2014*

Flourish Excel is a great product for keeping algae levels low and helping growth rate in your plants. If you can't afford or are nervous about injected CO2, this is a good middle step between low tech and high tech. I bought this for my 75 gallon planted tank a few months ago and still haven't needed to restock, even though I've been dosing it as directed daily plus during weekly 50% water changes. Definitely worth the investment over constantly buying containers a quarter this size through my local fish store.

### ⭐⭐⭐⭐⭐ Best price I've found
*by T***S on December 27, 2025*

I like this product and the price is the best I've found.

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*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-03-24*