--- product_id: 7734518 title: "MARINE ALGAEFIX Algae Control 16-Ounce Bottle" brand: "api" price: "301 kr" currency: DKK in_stock: true reviews_count: 12 category: "Api" url: https://www.desertcart.dk/products/7734518-marine-algaefix-algae-control-16-ounce-bottle store_origin: DK region: Denmark --- # Dosing every 3 days for lasting effect Safe for marine & reef life Fast-acting algae control MARINE ALGAEFIX Algae Control 16-Ounce Bottle **Brand:** api **Price:** 301 kr **Availability:** ✅ In Stock ## Summary > 🌿 Clear your reef, keep your vibe — algae control that works as hard as you do! ## Quick Answers - **What is this?** MARINE ALGAEFIX Algae Control 16-Ounce Bottle by api - **How much does it cost?** 301 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/7734518-marine-algaefix-algae-control-16-ounce-bottle) ## Best For - api enthusiasts ## Why This Product - Trusted api brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Trusted Legacy:** Backed by 50+ years of API’s aquatic innovation. - • **Reef-Safe Formula:** Protects corals, invertebrates & fish while clearing algae. - • **Tank Transformation:** Spend less time scrubbing, more time admiring your reef. - • **Easy Dosing Schedule:** Simple 3-day dosing until control, then weekly maintenance. - • **Rapid Algae Eradication:** Targets green, red slime & brown algae with precision. ## Overview API MARINE ALGAEFIX is a 16-ounce algae control solution designed specifically for marine and reef aquariums. It effectively eliminates green algae, red slime, and brown algae without harming corals, fish, or invertebrates. With a proven dosing schedule every three days until algae is controlled, then weekly maintenance, it ensures a pristine aquatic environment. Trusted by aquarists for over 50 years, this fast-acting, reef-safe formula transforms your tank into a crystal-clear underwater haven. ## Description API MARINE ALGAEFIX Algae Control effectively controls these types of algae: Green algae, "Red Slime", and "Brown algae" in saltwater aquariums. Works fast. Will not harm marine fish, corals or other invertebrates when used as directed. With API Aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For over 50 years, API has been creating innovative, research-driven solutions that make it easier to care for your fish and aquarium. API Aquarium Treatment Supplies are designed to work in conjunction with each other to provide best results to control algae, promote healthy bacterial growth and help control and cure fish diseases and conditions such as ich and fin rot. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. With API, you can spend more time admiring your fish, and less time scrubbing your tank. Make sure to use all products as directed in order to ensure the best results. Review: This stuff is a life (tank) saver! - I downsized from a 65g reef to a 28g cube last summer in preparation for a move. Because of everything going on, the tank was neglected. Within a month or so of neglect, some caulerpa macro algae had taken over the tank. It must have been a hitchhiker from the sump of my previous tank. I was literally filling up a 2 litter pitcher with algae every week as I was pulling it off of rocks and trying to get things under control. I was about ready to throw in the towel, boil all of my rock, and start over, but I decided to give AlgaeFix a chance. It took a few doses before I noticed anything, but probably late week 2, my skimmer started picking up a lot more "gunk" in the water. Over about a 2.5 month period, it has reduced the caulerpa by probably 90% and has it down to a manageable amount that I'm trying to eradicate through regular water changes and proper levels. AlgaeFix saved the life in my rock and saved me from giving up. I know a lot of people have asked if it will kill macro algae. I can confirm that the answer is yes, but it will take a long time before it wipes it out. I'm fully confident that you could clear up a hair algae breakout long before you decimate helpful algae in your sump. Great product that I will keep on hand for as long as I have reef tanks. Thanks! Review: Works on bubble algae! - Had a small but growing infestation of bubble algae. Took a couple of months - but it’s all gone!! Now I just dose once per week to make sure it doesn’t come back. ## Features - Contains one (1) API MARINE ALGAEFIX Algae Control 16-Ounce Bottle - Controls algae growth and keeps marine and reef aquariums clean and clear - Effectively controls these types of saltwater algae: Green algae (Cladophora), “Red Slime” (Oscillatoria / Spirulina major), “Brown Algae” (Cyclotella) in marine aquariums containing live corals, invertebrates and fish. - When used in salt water will not harm snails, clams, scallops, shrimp, anemones, sea cucumbers, feather dusters, coralline algae, soft corals, hard corals and other invertebrates. - Dose every three days until algae is under control then dose weekly ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0017JHBGY | | ASIN | B0017JHBGY | | Best Sellers Rank | #21,680 in Pet Supplies ( See Top 100 in Pet Supplies ) #199 in Aquarium Water Treatments | | Brand Name | API | | Color | Black | | Country of Origin | United States | | Customer Reviews | 4.4 4.4 out of 5 stars (2,198) | | Date First Available | June 24, 2004 | | Date First Available | June 24, 2004 | | Department | Unisex-Adult | | Department | Unisex-Adult | | Directions | It is a violation of federal law to use this product in a manner inconsistent with its labeling. Do not overdose. Use dosing cap on bottle to add 1 ml (1/5 tsp.) for each 10 gallons (38 L) or 5 ml (1 tsp.) for each 50 gallons (190 L) or 50 ml (10 tsp.) for each 500 gallons (1,890 L) of aquarium water. Repeat dose every 3 days until algae is controlled. Siphon or scrape any dead algae from aquarium… | | Is Discontinued By Manufacturer | No | | Item Dimensions LxWxH | 2 x 2 x 6 inches | | Item Package Dimensions L x W x H | 8.5 x 2.52 x 2.4 inches | | Item Weight | 3.2 ounces | | Item model number | 387D | | Item model number | 387D | | Manufacturer | Mars Fishcare | | Manufacturer | Mars Fishcare | | Material | Plastic | | Model Name | MARINE ALGAEFIX 16 OZ | | Number of Items | 1 | | Product Dimensions | 2 x 2 x 6 inches; 3.2 ounces | | Size | 16 Fl Oz (Pack of 1) | | Style | Aquarium Treatment | | Target Audience Keyword | fish | ## Product Details - **Brand:** API - **Item Form:** Liquid - **Item Weight:** 3.2 ounces - **Liquid Volume:** 16 Fluid Ounces - **Manufacturer:** Mars Fishcare ## Images ![MARINE ALGAEFIX Algae Control 16-Ounce Bottle - Image 1](https://m.media-amazon.com/images/I/51GliYvoWaL.jpg) ## Available Options This product comes in different **Pattern, Size** options. ## Questions & Answers **Q: Will this work on brown algae** A: API Algaefix is the top selling algaecide in the aquarium industry. API Algaefix Marine will treat brown algae as well as string algae and many others types of algae as well. **Q: I accidentally ordered this instead of the Algaefix for ponds that I normally use. The ingredients look to be the same are they in fact the same?** A: Yes, all Algaefix ( Pond, Marine and Aquarium) are all the same product. Dose as normal. **Q: Can I use this in my saltwater reef aquarium** A: Yes I have freshwater aqauriums and planted tanks **Q: I used algae fix in only fish marine aquariums and worked good but wit the time a black algae got. Why that happen and what can I do?** A: Keep treating with algaefix ( although chemicals can be a bit stressful on the fish, therefore the duration must be limited). More frequent water changes. Usually one algae replaces another. It’s a very hard battle to get ahead of. Check your filter to ensure you’re getting the proper turn over rate. Changing the food, and lowering the amount entering the tank. Also, reduce the amount of light (direct light and from light source) in addition to the amount of hours the lights are on. Use a sterilizer capable of level 1 sterilization, 24/7. All of these things combined should reduce the amount of algae. ## Customer Reviews ### ⭐⭐⭐⭐⭐ This stuff is a life (tank) saver! *by G***M on February 22, 2024* I downsized from a 65g reef to a 28g cube last summer in preparation for a move. Because of everything going on, the tank was neglected. Within a month or so of neglect, some caulerpa macro algae had taken over the tank. It must have been a hitchhiker from the sump of my previous tank. I was literally filling up a 2 litter pitcher with algae every week as I was pulling it off of rocks and trying to get things under control. I was about ready to throw in the towel, boil all of my rock, and start over, but I decided to give AlgaeFix a chance. It took a few doses before I noticed anything, but probably late week 2, my skimmer started picking up a lot more "gunk" in the water. Over about a 2.5 month period, it has reduced the caulerpa by probably 90% and has it down to a manageable amount that I'm trying to eradicate through regular water changes and proper levels. AlgaeFix saved the life in my rock and saved me from giving up. I know a lot of people have asked if it will kill macro algae. I can confirm that the answer is yes, but it will take a long time before it wipes it out. I'm fully confident that you could clear up a hair algae breakout long before you decimate helpful algae in your sump. Great product that I will keep on hand for as long as I have reef tanks. Thanks! ### ⭐⭐⭐⭐⭐ Works on bubble algae! *by M***T on July 28, 2025* Had a small but growing infestation of bubble algae. Took a couple of months - but it’s all gone!! Now I just dose once per week to make sure it doesn’t come back. ### ⭐⭐⭐⭐⭐ Beware NOT SAFE WILL KILL YOUR FISH AND CORAL *by H***C on June 17, 2025* NOT SAFE FOR CORAL. WILL NOT KILL HAIR ALAGE . WILL KILL YOUR FISH AND CORAL Do not use this chemical NOT REEF SAFE!!! Killed all my corals in three days. YES I USED PROPER DOSE !!! Followed instructions on bottle to the letter. This did not help at all. DECIMATED MY AQUARIUM. IM DISTRAUGHT AT WHAT THIS HAS DONE. YEARS OF HARD WORK DESTROYED IN THREE DAYS. ## Frequently Bought Together - API MARINE ALGAEFIX Algae Control 16-Ounce Bottle - API ALGAEFIX Algae Control 16-Ounce Bottle - API TAP WATER CONDITIONER Aquarium Water Conditioner 16-Ounce Bottle --- ## 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.dk/products/7734518-marine-algaefix-algae-control-16-ounce-bottle](https://www.desertcart.dk/products/7734518-marine-algaefix-algae-control-16-ounce-bottle) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-04-23*