---
product_id: 12404889
title: "Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L"
brand: "seachem"
price: "₨83053"
currency: LKR
in_stock: true
reviews_count: 11
category: "Seachem"
url: https://www.desertcart.lk/products/12404889-flourish-excel-bioavailable-carbon-organic-carbon-source-for-aquatic-plants
store_origin: LK
region: Sri Lanka
---

# 4L organic carbon boost precise dosing control iron-reducing tech Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L

**Brand:** seachem
**Price:** ₨83053
**Availability:** ✅ In Stock

## Summary

> 🌱 Unlock your aquarium’s green potential with Seachem Flourish Excel!

## Quick Answers

- **What is this?** Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 4L by seachem
- **How much does it cost?** ₨83053 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/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 Ally:** Effectively combats stubborn black hair algae, keeping your aquarium pristine and plants thriving.
- • **Iron Optimization Formula:** Enhances iron uptake by converting iron to its ferrous (Fe+2) state, maximizing nutrient absorption.
- • **Fish-Safe & Plant-Friendly:** Formulated to be completely safe for fish and invertebrates, ensuring a balanced, healthy ecosystem.
- • **Bioavailable Carbon Powerhouse:** Delivers a ready-to-use organic carbon source that accelerates aquatic plant growth without CO2 injection.
- • **Flexible Dosing for Every Tank:** Large 4L size with easy capful measurements supports both initial heavy dosing and maintenance schedules.

## Overview

Seachem Flourish Excel Bioavailable Carbon is a 4L liquid supplement designed to provide aquatic plants with an easily absorbed organic carbon source, bypassing the need for CO2 injection. It also promotes iron in its ferrous state for better plant uptake and helps control algae growth, all while being safe for fish and invertebrates. Ideal for professional aquarists seeking efficient, scalable plant nutrition and algae management.

## 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 | #48,329 in Pet Supplies ( See Top 100 in Pet Supplies ) #478 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 | 12.17 x 6.06 x 6.02 inches |
| Item Weight | 4.1 Kilograms |
| 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; 9.04 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:** 4.1 Kilograms
- **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 Sri Lanka*
*Store origin: LK*
*Last updated: 2026-03-10*