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🌿 Clear your reef, keep your vibe — algae control that works as hard as you do!
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.



















| ASIN | B0017JHBGY |
| Allergen Information | Apple Free |
| Best Sellers Rank | #22,251 in Pet Supplies ( See Top 100 in Pet Supplies ) #200 in Aquarium Water Treatments |
| Brand | API |
| Brand Name | API |
| Customer Reviews | 4.3 out of 5 stars 2,199 Reviews |
| Global Trade Identification Number | 00317163043875 |
| Item Form | Liquid |
| Item Type Name | Aquarium Algae Remover |
| Item Weight | 3.2 ounces |
| Liquid Volume | 16 Fluid Ounces |
| Manufacturer | Mars Fishcare |
| Manufacturer Part Number | 387D |
| Model Number | 387D |
| Number of Packs | 1 |
| Pet Type | Fish |
| Target Species | Shrimp |
| UPC | 317163043875 |
| Unit Count | 1 Ounce |
L**N
Will buy again
This is the best stuff i ever used, 40 gal tank, only a few drops needed. By next day, crystal clear
G**M
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!
A**1
Worked, but took a long time
I used this on my reef tank that had a huge green hair algae bloom out of no where. I read other reviews on this and was skeptical, but I wanted to do something to get rid of the hair algae besides removing all the rocks and scrub them. This is to be used once every 3 days until the algae is gone. At first it didn't look like it was doing much, but after a week or some the green hair algae length began to shrink down. It took about 2-3 weeks for it to almost disappear, but it did work and I can see the surface of the rocks again. After reading people's reviews on here it seemed that people were using this in fresh water tanks and it killed everything. A marine chemical shouldn't be used in a fresh water tank. The dosing on my 55 gallon tank was just over a half of the cap every three days. Read the directions and get the right chemical for your tank. I would have given it 5 stars, but it does take a long time for it to work. Still beats scrubbing all the algae.
M**4
Worked so fast, I didn’t get a before photo.
I cannot recommend this product highly enough! We have been going through months of Watteau changes, clarifiers, finger after filter replacement, and our tank was still green. I don’t know what caused it, but we could not get rid of it. My son’s tank then did the same thing. He researched it, said it looked like suspended algae and suggested buying this. The product was delivered while I was at soccer practice with my daughter. My son treated both tanks and I forgot about it. I went downstairs this afternoon thinking I would check it out, likely get somewhat of a before picture for comparison abs I saw this perfectly clear tank! Our fish still look healthy (albino tiger Oscar and plecostamus). My son’s tank is mostly clear (it might need one more dose) and his fish are healthy. I kid you not when I say that yesterday, we could barely see into these tanks. This product is amazing! Buy this, follow directions, and your life will get easier.
H**C
Beware NOT SAFE WILL KILL YOUR FISH AND CORAL
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.
A**J
killed macro but not microalgae in reef tank.
I have been using this for a month now and I would give it 2.5 stars. I have a bad hair algae bloom in my reef tank that is killing my zoas and driving me nuts. I bought this ad used as directed with no real noticeable change other than it slowed down growth a little, but certainly did not kill the algae. I have RO/DI water, a refugium, and a canister filter running. My macro algae is all but dead, but not the micro. Lighting is causing the problem so I turned that down and only feed my tank pellets once a day to limit nutrients. The last months I have been doing water changes weekly to biweekly. Yesterday and today I finally caved in and took out the majority of my rocks, scrubbed them down in a bucket, and placed them back in the tank. Hopefully with yet another dose of the Algaefix and scrubbed rocks I will see a difference. I wish this stuffed had worked on the microalgae as well as it did on my macro. Inverts are alive, but my clam is not happy and neither are my corals.
M**T
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.
R**O
Eliminated Dictyota
I discovered Dictyota algae in my 28G Nano Cube after it spread throughout much of my live rock, and from what I read this is one tough algae to eliminate considering it thrives in high quality water conditions. For two months I increased water changes to twice a week, limited my feedings, and continually checked water conditions for low phosphates. I read a few positive reviews about Algaefix Marine so I gave it a try. I'm very pleased with the results. Following the instructions with one dose every three days, I started seeing results after the third dose. I started seeing loose pieces of Dictyota flowing in the water column, and ending up in the filter. After the fourth dose, my Dictyota problem is already 95% eliminated. I also had a few finger algaes that are gone, and I haven't had any algae on the glass since I started the treatment. For whatever it's worth, I would turn off my overflow/filter pumps for about 30 minutes when I would add a dose of AlgaeFix, but I left my two power heads on to circulate the water. My plate coral emitted a secretion after the first dose, but showed no signs of stress after the first dose. Fish, shrimp, snails, and corals are all fine.
M**N
Works great
After 1use I can notice the algae dying in the fish pond. We had a big problem with algae but this product seems to be fixing the problem.
S**H
Five Stars
Fine
M**T
API Algae Fix Marine.
This product Algae Fix Marine has the same ingredients as the one for Fresh Water fish tanks. I have used both. They work very well. Corals, fish etc are not affected by it. I believe Vibrant is the same, but much more expensive. I don’t know why I bought such a big bottle as I only need 10 ml for 100 gallon marine tank.
S**H
Four Stars
Good
H**S
RIP Bob the Betta
Killed all our fish within hours. Very strong product. If using please be mindful.
Trustpilot
5 days ago
3 weeks ago