--- product_id: 4156359 title: "Seachem Flourish Excel 250 ml / 8.5 fl. oz." brand: "seachem" price: "€ 15.89" currency: EUR in_stock: true reviews_count: 13 category: "Seachem" url: https://www.desertcart.be/products/4156359-seachem-flourish-excel-250-ml-8-5-fl-oz store_origin: BE region: Belgium --- # Bioavailable organic carbon source Precise dosing for optimal plant health Iron reduction for better nutrient uptake Seachem Flourish Excel 250 ml / 8.5 fl. oz. **Brand:** seachem **Price:** € 15.89 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your aquatic garden with the carbon edge every pro aquascaper craves! ## Quick Answers - **What is this?** Seachem Flourish Excel 250 ml / 8.5 fl. oz. by seachem - **How much does it cost?** € 15.89 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/4156359-seachem-flourish-excel-250-ml-8-5-fl-oz) ## 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 - • **Instant Carbon Boost:** Delivers bioavailable organic carbon to supercharge aquatic plant growth. - • **Easy Precision Dosing:** Simple capful measurements ensure perfect carbon levels after water changes or routine maintenance. - • **Photosynthesis Shortcut:** Bypasses complex carbon chains, feeding plants ready-to-use carbon compounds. - • **Enhanced Iron Absorption:** Promotes ferrous iron (Fe+2) for maximum nutrient uptake and vibrant greenery. - • **Trusted Aquarium Essential:** Backed by 4.6-star reviews and decades of proven performance since 2004. ## Overview Seachem Flourish Excel is a 250 ml liquid organic carbon supplement designed to enhance aquatic plant growth by providing bioavailable carbon and improving iron uptake. Ideal for both initial dosing and maintenance, it supports photosynthesis by delivering ready-to-use carbon compounds, ensuring healthier, more vibrant aquatic plants. ## Description Seachem Flourish Excel Bioavailable Carbon - Organic Carbon Source for Aquatic Plants 250 ml Review: WOW! - I set up a new aquarium 3 months ago. I've had major algae issues. Plants have not been growing like they're supposed to. Nothing has seemed to be going right. I bought this product based on some recommendations on Youtube, and 2 weeks later... the algae is completely gone and the plants are thriving like I haven't seen since I set up the tank. The desertcart Sword plant has sprouted SIX new stems in the last 2 weeks. The Hornwort has reached the top of the aquarium. The stem plants are finally starting to get longer. I wish I'd started using this product day 1. I will buy it again, and again, and again. Review: Seachem Flourish Excl - I haven't used this long, but I have enjoyed the results so far. I have several plants in a 2-gallon Betta tank. I dose the tank with Flourish, Flourish Iron, and this. And I have seen growth within the first week. I have to dose in very small amounts (1 drop is less than half the recommended dose for that size, two drops is too much) but I do see a difference. I have avoided Excel for the longest time because I heard the stories of people overdosing (accidentally or not) and killing everything in their tank. I can dose correctly, but I didn't want to take the risk with something so dangerous to tank life even if slightly overdosed. I am currently cycling the tank that the plants are in, so no fish yet, but I am sure it will be safe even at the recommended dose, let alone half it. I see lots of people saying they "prefer Excel to Flourish." They are completely different products. Flourish is a micro trace element fertilizer. Excel is a carbon-providing fertilizer. They can be used in conjunction, or separately, but they are separate products. They should not be compared "one or the other." The active ingredient is actually a sterilizer, and is used in some algaecide products. So this means yes, it can be used to kill algae. However Seachem does not market it as such, so you will find no official approval of the product as such from them. The bottle, unlike other Seachem product bottles, contains a ratcheting child safety cap. I see some people say it breaks easily on them, but I haven't had mine break yet. This has a cap like that for a very good reason. This stuff could be dangerous. Not only can some people react to it if it touches their skin or they breath it, but it should be kept well away from anyone who might think it would be a good idea to pour it in a tank, because "it's a fertilizer, so it'll be good for the plants." All fertilizer products should be kept up, but if you overdose with Flourish, you are likely only to have an algae problem if you don't do a water change soon enough. If you overdose with Excel, it will kill everything in the tank. ## 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. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001EUE6SC | | Allergen Information | Gluten Free | | Best Sellers Rank | #97,806 in Pet Supplies ( See Top 100 in Pet Supplies ) #851 in Aquarium Water Treatments | | Brand | Seachem | | Brand Name | Seachem | | Customer Reviews | 4.6 out of 5 stars 2,474 Reviews | | Global Trade Identification Number | 00000116045605 | | Item Form | Liquid | | Item Type Name | Aquarium Water Treatments | | Item Weight | 8.8 ounces | | Liquid Volume | 250 ml | | Manufacturer | Seachem Laboratories, Inc. | | Manufacturer Part Number | 456 | | Model Number | 456 | | Number of Items | 1 | | Number of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 780231504224 000116045605 | | Unit Count | 1 Count | | Warranty Description | Warranty | ## Product Details - **Brand:** Seachem - **Item Form:** Liquid - **Item Weight:** 8.8 ounces - **Liquid Volume:** 250 ml - **Number of Packs:** 1 ## Images ![Seachem Flourish Excel 250 ml / 8.5 fl. oz. - Image 1](https://m.media-amazon.com/images/I/510f5gSD3nL.jpg) ![Seachem Flourish Excel 250 ml / 8.5 fl. oz. - Image 2](https://m.media-amazon.com/images/I/61DE3GFxudL.jpg) ![Seachem Flourish Excel 250 ml / 8.5 fl. oz. - Image 3](https://m.media-amazon.com/images/I/618Ad5zC5wL.jpg) ![Seachem Flourish Excel 250 ml / 8.5 fl. oz. - Image 4](https://m.media-amazon.com/images/I/61B0IY2G5-L.jpg) ![Seachem Flourish Excel 250 ml / 8.5 fl. oz. - Image 5](https://m.media-amazon.com/images/I/81XsBrVqySL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ WOW! *by E***L on January 17, 2026* I set up a new aquarium 3 months ago. I've had major algae issues. Plants have not been growing like they're supposed to. Nothing has seemed to be going right. I bought this product based on some recommendations on Youtube, and 2 weeks later... the algae is completely gone and the plants are thriving like I haven't seen since I set up the tank. The Amazon Sword plant has sprouted SIX new stems in the last 2 weeks. The Hornwort has reached the top of the aquarium. The stem plants are finally starting to get longer. I wish I'd started using this product day 1. I will buy it again, and again, and again. ### ⭐⭐⭐⭐⭐ Seachem Flourish Excl *by D***E on July 31, 2014* I haven't used this long, but I have enjoyed the results so far. I have several plants in a 2-gallon Betta tank. I dose the tank with Flourish, Flourish Iron, and this. And I have seen growth within the first week. I have to dose in very small amounts (1 drop is less than half the recommended dose for that size, two drops is too much) but I do see a difference. I have avoided Excel for the longest time because I heard the stories of people overdosing (accidentally or not) and killing everything in their tank. I can dose correctly, but I didn't want to take the risk with something so dangerous to tank life even if slightly overdosed. I am currently cycling the tank that the plants are in, so no fish yet, but I am sure it will be safe even at the recommended dose, let alone half it. I see lots of people saying they "prefer Excel to Flourish." They are completely different products. Flourish is a micro trace element fertilizer. Excel is a carbon-providing fertilizer. They can be used in conjunction, or separately, but they are separate products. They should not be compared "one or the other." The active ingredient is actually a sterilizer, and is used in some algaecide products. So this means yes, it can be used to kill algae. However Seachem does not market it as such, so you will find no official approval of the product as such from them. The bottle, unlike other Seachem product bottles, contains a ratcheting child safety cap. I see some people say it breaks easily on them, but I haven't had mine break yet. This has a cap like that for a very good reason. This stuff could be dangerous. Not only can some people react to it if it touches their skin or they breath it, but it should be kept well away from anyone who might think it would be a good idea to pour it in a tank, because "it's a fertilizer, so it'll be good for the plants." All fertilizer products should be kept up, but if you overdose with Flourish, you are likely only to have an algae problem if you don't do a water change soon enough. If you overdose with Excel, it will kill everything in the tank. ### ⭐⭐⭐⭐⭐ Good for growing healthy plants *by A***R on October 18, 2015* In combination with either Flourite or Eco-complete substrates, I've used Excel for years for my planted tanks. With zero buffering capacity (kh) in the pH 8 well water I had, using a CO2 system guaranteed gorgeous plants but dead fish because of the resulting the wide swings of pH. Excel allows me to have a low tech tank and works wonders for the low to medium light plants that I prefer (crypts, anubias, java ferns, along with higher light wisteria and egeria densa used to combat algae from getting established before the plants do). I now have pH7 water with 2 degrees of hardness and will continue with Excel. For my latest tank (20 long), I've been adding 2ml every day -- it took a month for the plants to establish and start growing. I'll taper off to every other day soon. I expected the crypts to completely melt when first planted because, well, they are crypts and that's what they do. But they didn't melt and are already putting out new leaves and coloring up nicely. This tank also has 2 small Amazon swords planted in the higher light areas of the tank -- they lost their original leaves (they were grown emerged) and now have beautiful truly submerged foliage. I don't have any luck using liquid fertilizers or laterite - I'm amazed at all the different kinds of algae I managed to grow when I used them. By using Excel and adding Osmocote pelleted fertilizer deep under the substrate just where heavy feeding plants' roots are, that seems to limit excess nutrients. I've heard that egeria densa doesn't do well with Excel but mine is doing great and growing like a weed while floating over the top of the water. It's never affected my fish, snails or shrimp either. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/4156359-seachem-flourish-excel-250-ml-8-5-fl-oz](https://www.desertcart.be/products/4156359-seachem-flourish-excel-250-ml-8-5-fl-oz) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-09*