--- product_id: 3538368 title: "Seachem Flourish Iron 100 mL / 3.4 fl. oz." brand: "seachem" price: "$24.41" currency: USD in_stock: true reviews_count: 13 url: https://www.desertcart.us/products/3538368-seachem-flourish-iron-100-ml-3-4-fl-oz store_origin: US region: United States of America --- # Rapid iron availability post-application Optimized for aquatic plant absorption 10,000 mg/L ferrous iron concentration Seachem Flourish Iron 100 mL / 3.4 fl. oz. **Brand:** seachem **Price:** $24.41 **Availability:** βœ… In Stock ## Summary > 🌿 Fuel your underwater jungle with precision iron power! ## Quick Answers - **What is this?** Seachem Flourish Iron 100 mL / 3.4 fl. oz. by seachem - **How much does it cost?** $24.41 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/3538368-seachem-flourish-iron-100-ml-3-4-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 - β€’ **Phosphate & Nitrate Free:** Pure iron supplement without unwanted nutrient overload or algae triggers. - β€’ **Fast-Acting Nutrient Power:** Iron presence spikes immediately after dosing, fueling visible plant growth. - β€’ **Trusted by Aquascaping Pros:** Top-rated with 4.8 stars and years of proven results in planted aquariums. - β€’ **Ultra-Concentrated Iron Boost:** Delivers a potent 10,000 mg/L ferrous iron dose for thriving aquatic plants. - β€’ **Ferrous Iron for Maximum Uptake:** Pre-reduced iron form means plants expend zero energy converting nutrients. ## Overview Flourish Iron is a highly concentrated 100 mL liquid supplement containing 10,000 mg/L ferrous iron gluconate, designed specifically for planted aquariums. Unlike ferric iron-EDTA, this ferrous form is immediately bioavailable to aquatic plants, promoting faster and healthier growth without phosphate or nitrate additives. Ideal for aquarists seeking rapid nutrient uptake and enhanced plant vitality. ## Description Iron is immobile in plants. This means that plants cannot divert iron from older leaves to new ones. Therefore, deficiency symptoms appear first on new or young leaves. Because plants use iron to produce chlorophyll, a lack of iron results in chlorosis, or yellowing, of the younger leaves. Stems may also appear short and slender. If the deficiency is severe and prolonged, each new leaf emerges lighter in color than the preceding leaf. When choosing an iron supplement, it is important to know the distinction between the two forms of iron. The iron will be in one of two oxidation states: ferrous having a +2 charge, or ferric having a +3 charge. Ferrous iron, the preferred iron form and is soluble in water at any pH. Ferric iron, however, is only soluble below a pH of around 5.5; but if the pH is higher than 5.5, which more than likely it will be in a planted aquarium, the ferric iron will become insoluble and precipitate, settling in the root zone. Once this occurs, foliar absorbtion becomes impossible. To overcome this precipitation, competing products employ a chelate of ferric iron: iron-EDTA. While this does keep it soluble, it has a couple of drawbacks with respect to foliar uptake of iron. (1) Iron-EDTA bonding is very strong, thus very little of the iron will be available to the plants over a given time frame and (2) Physiological energy must be expended by the plant in order to extract the ferric iron from EDTA-iron and then convert (reduce) it to the ferrous form. Our approach is different in that we use a complex (not chelate) of ferrous iron in Flourish Ironβ„’. ## Features - Highly concentrated - Iron supplement - For planted aquarium ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B00029QPKS | | Best Sellers Rank | #975 in Aquarium Water Treatments | | Date First Available | October 2, 2001 | | Item Model Number | 475 | | Manufacturer | Seachem Laboratories, Inc. | | Product Dimensions | 1.62 x 1.62 x 4.88 inches; 1.76 ounces | ## Product Details - **Brand:** Seachem - **Item Form:** Liquid - **Item Weight:** 1.76 Ounces - **Liquid Volume:** 100 Milliliters - **Manufacturer:** Seachem Laboratories, Inc. ## Images ![Seachem Flourish Iron 100 mL / 3.4 fl. oz. - Image 1](https://m.media-amazon.com/images/I/515uSC2JPIL.jpg) ![Seachem Flourish Iron 100 mL / 3.4 fl. oz. - Image 2](https://m.media-amazon.com/images/I/71+vrdY27QL.jpg) ![Seachem Flourish Iron 100 mL / 3.4 fl. oz. - Image 3](https://m.media-amazon.com/images/I/91w6wi5yS0L.jpg) ![Seachem Flourish Iron 100 mL / 3.4 fl. oz. - Image 4](https://m.media-amazon.com/images/I/31mqPS0FHzL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Nutrients *by on Reviewed in the United States March 15, 2026* Great for aquatic plants! ### ⭐⭐⭐⭐⭐ Planted Aquarium *by on Reviewed in the United States June 20, 2025* I've been buying this product for several years. I use it approximately once a week. Iron test kits show that applying this product definitely shows iron presence immediately after applying. After 24 - 48 hours, iron is no longer detected. Plants observably show better growth when using it. ### ⭐⭐⭐⭐⭐ Good product *by on Reviewed in the United States March 1, 2024* Had have my plants growing fast --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/3538368-seachem-flourish-iron-100-ml-3-4-fl-oz](https://www.desertcart.us/products/3538368-seachem-flourish-iron-100-ml-3-4-fl-oz) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-15*