---
product_id: 51247231
title: "Flourish Excel, 250 ml"
brand: "seachem"
price: "€ 29.76"
currency: EUR
in_stock: true
reviews_count: 13
category: "Seachem"
url: https://www.desertcart.de/products/51247231-flourish-excel-250-ml
store_origin: DE
region: Germany
---

# Supports healthy plant growth 250 ml bioavailable carbon Precise dosing for safe use Flourish Excel, 250 ml

**Brand:** seachem
**Price:** € 29.76
**Availability:** ✅ In Stock

## Summary

> 🌿 Elevate your planted tank game—grow greener, cleaner, and cooler!

## Quick Answers

- **What is this?** Flourish Excel, 250 ml by seachem
- **How much does it cost?** € 29.76 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/51247231-flourish-excel-250-ml)

## 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

- • **Dual Action Power:** Enhances plant photosynthesis while naturally suppressing algae over time.
- • **Easy, Controlled Dosing:** Simple capful measurements ensure safe, effective nutrient delivery every time.
- • **Long-Lasting & Efficient:** Small daily doses stretch your 250 ml bottle for months of thriving aquatic plants.
- • **Perfect for Low-Tech Setups:** Ideal for low-light, low-CO2 tanks—grow hardy plants like anubias and jungle val effortlessly.
- • **Boost Your Aquarium’s Greenery:** Bioavailable organic carbon fuels lush plant growth without CO2 injection hassle.

## Overview

Seachem Flourish Excel is a 250 ml liquid carbon supplement designed as an alternative or complement to CO2 injection in planted aquariums. It delivers bioavailable organic carbon that promotes healthy plant growth and helps control algae naturally. With precise dosing guidelines, it’s perfect for low-tech tanks and supports a vibrant aquatic ecosystem.

## Description

Product Description Seachem Flourish Excel 250Ml 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, note that each cap thread is approximately 1 mL. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains water treatment See more

Review: Essential - A must in my opinion for any aquarium enthusiast with a planted tank. This provides some necessary nutrition for water borne plants and helps with healthy growth. Since using my plants have been flourishing and lots of healthy growth which means happy fish. Lasts quite a while for me as only have a small tank. As the plants flourish they compete with algae for nutrients and then causes algae to decline.
Review: You need to understand what it is and how it works... - I know lots of people rave about this stuff and others hate it, and obviously I can only speak from my own personal experience (and I don't for a second claim to be any kind of expert!), but I have been using this in my low tech, low light setup for over a year now and have seen good results. The main thing to know and understand about this product is that this is NOT liquid CO2! It gets called liquid CO2 all the time, but that's more of a casual term rather than an accurate description. (Liquid CO2 only exists at very high pressures which obviously can't exist in a soft plastic bottle) What this actually IS, is quite a potent and potentially very harmful chemical (if not dosed properly) which over the course of about 24 hours in your tank, goes through a molecular change to 'become' carbon that your plants can then utilise for further growth. (I can't pretend to know or understand the whole science involved, but there are some very informative videos on YouTube explaining this process in detail 🤓). Because its only safe to dose this in relatively small amounts it means that you're going to be limited to the amount of carbon you're going to be able to add to your system over any given period. Therefore, I've found its only really helpful when you're trying to grown relatively easy, low CO2 demanding plants rather than anything that requires high levels of CO2 (like a lot of carpeting plants for example). If that's what you want, you're gonna need to look at the high tech approach... Coupled with low lights, I've found that I'm getting good healthy slow growth of plants like anubias, desertcart swords, jungle val, and bacopa. Also (with dosing it sensibly), I've not had any problems with it effecting my shrimp or snails 👍 Also, over time, this chemical acts as a very effective anti-algae additive- some people use it just for that- but that is OVER TIME! Don't over dose your tank on it trying to get rid of the stuff! (Or you'll kill everything! Not just the algae... 😵🤣) Anyway, hope this helps! ✌

## Features

- Causes serious eye irritation.
- Causes skin irritation.
- May cause allergy or asthma symptoms or breathing difficulties if inhaled.
- May cause an allergic skin reaction.
- May cause respiratory irritation.
- Bioavailable organic carbon source for the planted aquarium
- Use as an alternative to CO2 injection or in addition to it
- Introduces photosynthetic intermediates
- Model number: 020987

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001EUE6SC |
| Allergen Information | Gluten Free |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 12,455 in Pet Supplies ( See Top 100 in Pet Supplies ) 204 in Aquarium Water Treatments |
| Customer Reviews | 4.5 4.5 out of 5 stars (2,767) |
| Date First Available | 30 Jun. 2009 |
| External Testing Certification | Não aplicável |
| Item Form | Liquid |
| Item Weight | 30 g |
| Item model number | 456 |
| Number of Items | 1 |
| Pet Type | Fish |
| Product Dimensions | 12.45 x 6.1 x 5.59 cm; 30 g |
| Quantity | 1 |
| Size | 250 ml (Pack of 1) |
| Specific Uses | Indoor |
| Volume | 250 Millilitres |

## Product Details

- **Brand:** Seachem
- **Item form:** Liquid
- **Liquid volume:** 250 Millilitres
- **Manufacturer:** Seachem
- **UPC:** 780231504224 000116045605

## Images

![Flourish Excel, 250 ml - Image 1](https://m.media-amazon.com/images/I/510f5gSD3nL.jpg)

## Questions & Answers

**Q: Is this snail and shrimp safe**
A: I’ve got 8 amano shrimp in my tank and have used this several times whenever the BBA gets a bit out of control. Never lost a shrimp when using this product or seen any change in behaviour so I would say it is invertebrate safe.

**Q: Would this get rid of black beard algae?**
A: Not on it's own. Dosed daily it can help keep it under control. But, only if other variables are under control, feeding, co2, lighting etc.
Spot dosing hydrogen peroxide 3% (filter switched off for 30min can also help.

**Q: Can this be used with Stability?**
A: Hi there.  Yes it can because Seachem Flourish is a plant feeder.
Regards
Carol

**Q: Is the safe to use in a community fish tank would this harm fish ? thanks**
A: Safe to use within the dosage.     My plants and tank clarity improved, also reduced Blackbeard algae

## Customer Reviews

### ⭐⭐⭐⭐⭐ Essential
*by T***X on 31 October 2025*

A must in my opinion for any aquarium enthusiast with a planted tank. This provides some necessary nutrition for water borne plants and helps with healthy growth. Since using my plants have been flourishing and lots of healthy growth which means happy fish. Lasts quite a while for me as only have a small tank. As the plants flourish they compete with algae for nutrients and then causes algae to decline.

### ⭐⭐⭐⭐⭐ You need to understand what it is and how it works...
*by A***H on 28 March 2021*

I know lots of people rave about this stuff and others hate it, and obviously I can only speak from my own personal experience (and I don't for a second claim to be any kind of expert!), but I have been using this in my low tech, low light setup for over a year now and have seen good results. The main thing to know and understand about this product is that this is NOT liquid CO2! It gets called liquid CO2 all the time, but that's more of a casual term rather than an accurate description. (Liquid CO2 only exists at very high pressures which obviously can't exist in a soft plastic bottle) What this actually IS, is quite a potent and potentially very harmful chemical (if not dosed properly) which over the course of about 24 hours in your tank, goes through a molecular change to 'become' carbon that your plants can then utilise for further growth. (I can't pretend to know or understand the whole science involved, but there are some very informative videos on YouTube explaining this process in detail 🤓). Because its only safe to dose this in relatively small amounts it means that you're going to be limited to the amount of carbon you're going to be able to add to your system over any given period. Therefore, I've found its only really helpful when you're trying to grown relatively easy, low CO2 demanding plants rather than anything that requires high levels of CO2 (like a lot of carpeting plants for example). If that's what you want, you're gonna need to look at the high tech approach... Coupled with low lights, I've found that I'm getting good healthy slow growth of plants like anubias, amazon swords, jungle val, and bacopa. Also (with dosing it sensibly), I've not had any problems with it effecting my shrimp or snails 👍 Also, over time, this chemical acts as a very effective anti-algae additive- some people use it just for that- but that is OVER TIME! Don't over dose your tank on it trying to get rid of the stuff! (Or you'll kill everything! Not just the algae... 😵🤣) Anyway, hope this helps! ✌

### ⭐⭐⭐⭐ Not a miracle worker, but certainly helps with BBA
*by E***Y on 21 July 2023*

If you pair this product with weekly 50% water changes and a reduction in lighting, your plants will thank you. Saw good results in BBA reduction, going grey and dying within the first week. Stubborn, well established BBA is still there but greatly reduced. Rooted and epiphyte plants grew significantly as well even with lower light. Overall, great product to deal with a tank that has been neglected for a few weeks and needs a ‘reset’ but wouldn’t recommend as a constant addition due to the chemicals within the product being not great for aquatic life for a prolonged amount of time.

## Frequently Bought Together

- Seachem Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 250 ml
- Seachem Flourish Freshwater Plant Supplement - Aquarium Element and Nutrient Blend 250 ml
- Seachem Flourish Tabs Growth Supplement - Aquatic Plant Stimulant 40 ct

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-01-23*