--- product_id: 3600461 title: "Seachem Flourish Excel 500 ml" brand: "seachem" price: "€ 33.51" currency: EUR in_stock: true reviews_count: 13 category: "Seachem" url: https://www.desertcart.at/products/3600461-seachem-flourish-excel-500-ml store_origin: AT region: Austria --- # Bioavailable organic carbon source Safe dosing for fish & aquatic life Iron in ferrous (Fe+2) state for max uptake Seachem Flourish Excel 500 ml **Brand:** seachem **Price:** € 33.51 **Availability:** ✅ In Stock ## Summary > 🌱 Elevate your aquarium’s green game—grow smarter, not harder! ## Quick Answers - **What is this?** Seachem Flourish Excel 500 ml by seachem - **How much does it cost?** € 33.51 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.at](https://www.desertcart.at/products/3600461-seachem-flourish-excel-500-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 - • **Fish-Safe & Easy Dosing:** Gentle on aquatic life with simple, precise dosing instructions for any tank size. - • **Maximize Iron Absorption:** Promotes ferrous iron (Fe+2) for vibrant, lush plant coloration and vitality. - • **Algae Control & Plant Health:** Dual-action formula reduces algae while enhancing plant robustness—no CO2 system needed. - • **Trusted Science-Backed Brand:** Over 30 years of innovation from hobbyists for hobbyists, ensuring reliable, proven results. - • **Boost Plant Growth Effortlessly:** Delivers ready-to-use organic carbon to supercharge photosynthesis without complex setups. ## Overview Seachem Flourish Excel 500 ml is a scientifically formulated liquid carbon supplement that provides bioavailable organic carbon and promotes iron uptake in the ferrous state, enhancing photosynthesis and plant growth. Safe for fish and aquatic life, it also helps control algae, making it an essential, easy-to-use solution for thriving planted aquariums without the need for complex CO2 systems. ## Description All plants require a source of carbon, and Flourish Excel is a great and convenient source of bioavailable organic carbon.For over three decades, Seachem has been a company rooted in sound science. Our experience in the hobby and an educated staff of chemists and biologists are part of the package when you purchase Seachem products. Seachem remains as one of the few surviving independent and privately owned pet care companies. Seachem is owned and operated by hobbyists. All of our employees are hobbyists who maintain aquariums at home and at the office. Seachem itself was started because one such passionate hobbyist - Dr. Leo G. Morin (Founder) - recognized that the available solutions to aquarists problem wanting. This resulted in Seachem’s very first product: Cupraplex (today known as Cupramine). Over thirty years later Seachem is still approaching old problems in a new way. Seachem’s philosophy is that the knowledgeable hobbyist makes the best customer. This is reflected in solid and reliable customer education and support as well as products proven in science and performance. While Seachem has grown rapidly into a national and international firm, it retains the culture of a small company and is readily available to its customers. Review: A Staple for Healthy, Growing Aquarium Plants - I keep coming back to Seachem Flourish Excel because it consistently helps my aquarium plants stay healthy and grow well. After regular dosing, I’ve noticed stronger growth and better overall plant appearance. It’s easy to dose, and the bottle lasts a good amount of time depending on tank size. I’ve had good results using it as part of a regular maintenance routine, especially in planted tanks where I want steady growth without setting up a full CO2 system. The plants respond well, and I’ve seen improved color and vitality over time. As long as you follow the recommended dosing instructions, it integrates easily into a standard care schedule. If you maintain a planted aquarium and want reliable support for plant health, this has been a dependable product in my experience. Review: Excellent product for algae control and for plant growth - I purchased this product after some plants I had bought introduced black beard algae to my aquarium. I tried a couple of other products prior to this with no luck. I tried spot treating with Hydrogen Peroxide and while that did seem to work, it was too difficult to use. I had the algae all over the tank to the point that the Hydrogen Peroxide just wasn't a practical solution. I've been using the Flourish Excel for about five weeks now. After maybe ten days to two weeks, it had basically eradicated my algae problem. I still have a couple of spots of green or brown algae here or there - but it's exactly that, just spots. I suspect the Flourish Excel works better or worse on different kinds of algae (as it completely destroyed my problem Black Beard algae) but even on the algae that it doesn't completely take care of, it certainly reduces it and holds it at bay. Additionally, the plants seem to love it. It took a couple of weeks before I noticed substantial enough plant growth that I was sure it was because of the products and not simply regular expected growth from the plants naturally. I have been using this product in conjunction with a shrimp safe liquid fertilizer and my plants have benefitted greatly. My desertcart Swords in particular have tripled in size since starting this product with the liquid fertilizer. Very pleased. Great product, with no side effects to the fish, snails, or shrimp and crawfish 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. - 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 | B000256962 | | Allergen Information | Gluten Free | | Best Sellers Rank | #4,580 in Pet Supplies ( See Top 100 in Pet Supplies ) #23 in Aquarium Water Treatments | | Brand | Seachem | | Brand Name | Seachem | | Customer Reviews | 4.7 out of 5 stars 5,759 Reviews | | Global Trade Identification Number | 00000116045308 | | Included Components | Seachem Flourish Excel 500 ml | | Item Form | Liquid | | Item Type Name | Seachem Flourish Excel 500 ml | | Item Weight | 454 Grams | | Liquid Volume | 500 Milliliters | | Manufacturer | Seachem Laboratories, Inc. | | Manufacturer Part Number | 075225 | | Model Number | 116045308 | | Number of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | UPC | 752190152686 000116045308 | | Unit Count | 8.4 Fluid Ounces | | Warranty Description | Warranty | ## Product Details - **Brand:** Seachem - **Item Form:** Liquid - **Item Weight:** 454 Grams - **Liquid Volume:** 500 Milliliters - **Number of Packs:** 1 ## Images ![Seachem Flourish Excel 500 ml - Image 1](https://m.media-amazon.com/images/I/61V3cVDRUYL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: What causes this product to kill algae, and does it kill anything else (like beneficial bacteria)?** A: I bought the Seachem Flourish Excel because it seems to be the best solution to a Black Beard Algae problem I'm having, and after studying what it does, and how it does it, I too was worried about the Beneficial Bacteria in my 2 large canister filters.Couldn't find a direct answer to that question, so I sent an e-mail directly to Seachem Laboratories. Here is my question to them and their reply...... Message: I have a 72 gal heavily planted community tank and am having an outbreak of Black Beard Algae. I purchased your product as it seems the best solution to the problem, but I need a question answered before I can use your product. I now understand how your product works, but will this product also kill off the Beneficial Bacteria inside the Seachem Matrix Bio-Media of my 2 large canister filters?! Crashing the cycle in my tank is not an option. Is this product (Flourish Excel) safe to use for the bacteria that maintains the nitrogen cycle of my tank, or will it kill the bacteria in my filter media along with the Black Beard Algae and crash the nitrogen cycle of my tank? Need a straight answer, please, Thank You Seachem Support 10304 (Seachem Laboratories) Sep 23, 2022, 16:31 ADT Hi there, thanks for reaching out! No, Excel will not affect your biological filtration if dosed appropriately. Hope this helps! Seachem Support 10304 Needless to say, I am very relieved, and pleased. Now I can start the process of getting rid of that Black Beard Algae and not worry about crashing my nitrogen cycle. 2 Thumbs Up to Seachem Laboratories! **Q: are they copper free?** A: No. They contain 0.001% copper. Though people have used them in shrimp tanks without a problem, others have had shrimp die, particularly if the tablet got stirred up from the substrate (rescaping, fish burrowing, etc). If there's a chance of your substrate being disturbed, I'd recommend going with API Root Tabs instead, as they do not contain copper. **Q: How I use this for my tank 20 gallons** A: Per the instructions: "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." 1 cap = 5ml 1 cap for every 50 gallon equates to 1 ml for every 10 gallons or 2 ml for 20 gallons. **Q: Is the product compatible with freshwater invertebrates, like amano shrimp?** A: I use this product on a regular basis and I have snails and shrimp in my tank. No problems. ## Customer Reviews ### ⭐⭐⭐⭐⭐ A Staple for Healthy, Growing Aquarium Plants *by K***T on March 1, 2026* I keep coming back to Seachem Flourish Excel because it consistently helps my aquarium plants stay healthy and grow well. After regular dosing, I’ve noticed stronger growth and better overall plant appearance. It’s easy to dose, and the bottle lasts a good amount of time depending on tank size. I’ve had good results using it as part of a regular maintenance routine, especially in planted tanks where I want steady growth without setting up a full CO2 system. The plants respond well, and I’ve seen improved color and vitality over time. As long as you follow the recommended dosing instructions, it integrates easily into a standard care schedule. If you maintain a planted aquarium and want reliable support for plant health, this has been a dependable product in my experience. ### ⭐⭐⭐⭐⭐ Excellent product for algae control and for plant growth *by D***. on March 14, 2024* I purchased this product after some plants I had bought introduced black beard algae to my aquarium. I tried a couple of other products prior to this with no luck. I tried spot treating with Hydrogen Peroxide and while that did seem to work, it was too difficult to use. I had the algae all over the tank to the point that the Hydrogen Peroxide just wasn't a practical solution. I've been using the Flourish Excel for about five weeks now. After maybe ten days to two weeks, it had basically eradicated my algae problem. I still have a couple of spots of green or brown algae here or there - but it's exactly that, just spots. I suspect the Flourish Excel works better or worse on different kinds of algae (as it completely destroyed my problem Black Beard algae) but even on the algae that it doesn't completely take care of, it certainly reduces it and holds it at bay. Additionally, the plants seem to love it. It took a couple of weeks before I noticed substantial enough plant growth that I was sure it was because of the products and not simply regular expected growth from the plants naturally. I have been using this product in conjunction with a shrimp safe liquid fertilizer and my plants have benefitted greatly. My Amazon Swords in particular have tripled in size since starting this product with the liquid fertilizer. Very pleased. Great product, with no side effects to the fish, snails, or shrimp and crawfish in the tank. ### ⭐⭐⭐⭐⭐ Black Beard Algae in my 20 Gallon Planted Tank *by Y***P on July 27, 2019* --Update-- The algae has begun to disintegrate and fast. It's patchy now and coming off in clumps. The rocks pictured were 90% covered in dark hair. You can see it is no longer a healthy algae color. The green spots I suspect are cyanobacteria but it hasn't spread beyond those rocks in months. If it does I have Blue-Green Stain Remover which works wonders. After one more day I'll do a good 50% water change and my tank will be beautiful again. This stuff is amazing. They should really advertise its algae controlling properties more. I know it's not really this products job to kill algae, but it seems to be a good side effect of it helping plants grow. It really drives a wedge between aquatic plants and algae. Bought this because I got an infestation of black hair/black beard algae. It came in on the back of an assassin snail and began to cover everything. It's friggin everywhere. After research I found there are 3 options: Start over, use hydrogen peroxide , or use this stuff. Since I added the first dose of this 6 days ago 2 things have happened: The algae has stopped spreading and plants that were struggling or just slow to grow have started improving drastically. I even see a 1/4" of new susswassertang popping out of the algae that is covering it. I've never seen it grow that fast. I wish I had started using this stuff sooner. As of now the algae is not dead yet, but I'm sure it will be since it's color has changed from very dark green to a sickly light green with spots that look like rust. I'm thinking that with the ferrous iron going on, I might even see more red coloring in my ludwigia in the future. I've got tetras, assassin snails, amano shrimp and "pest snails" and they all seem unaffected by the product, so 5 stars all the way. A note about the snails: assassin snails are not a good way to control "pest snails" You put those guys in there and they go to work eating as many pond snails as they are able all the while mating and laying eggs every day. My tanks is going to crash hard when they all hatch. Right now I'm just trying to save my beautiful plants in time to migrate them and the fish and shrimps out. I'm going to migrate some pond snails over as well. Turns out they weren't pests. They were policing the algae better than anything in the tank. The assassin snails mucked that up right good. ## Frequently Bought Together - Seachem Flourish Excel 500 ml - Seachem Flourish Freshwater Plant Supplement 500 ml - Seachem Prime Fresh and Saltwater Conditioner - Chemical Remover and Detoxifier 500 ml --- ## 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.at/products/3600461-seachem-flourish-excel-500-ml](https://www.desertcart.at/products/3600461-seachem-flourish-excel-500-ml) --- *Product available on Desertcart Austria* *Store origin: AT* *Last updated: 2026-07-13*