API Algae Destroyer Advanced, 8-Ounce

This product worked as described by the manufacturer. It killed and precipitated the algea without damaging the plants, snails, etc. The bottle is well-designed and well-manufactured. The amount is plentiful for a household aquarium. Make sure to follow the instructions on the bottle in terms of how much and how often to add per gallon.

I put the recommended amount in my tank 3 days ago. The first two days the water was cloudy, but I could see on day 1 that algae was clearing from the ornamental rocks (which were previously black/green with algae). On the third day the water cleared up, and even more algae had died. I will be doing the weekly 20% water change tomorrow and will add another dose, according to the directions. This stuff really works. And, I had fresh charcoal in the filter the day before I started the treatment, so not sure why other reviews say you must remove it (directions don't mention that, either). My fish were never in distress. They are a variety of tetras, cories and a lone guppie. I have tried every natural way of controlling algae I could find and nothing worked. Love this stuff.

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This is a great product. I have used it for years. Helps so very much with the algae buildup. Definitely a great product.

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I use this in my outdoor fish pond and it really works to keep the algae at bay. If you have a lot of algae to start with, I recommend getting rid of as much of it as possible before using this product because it will definitely kill the algae, but you will have to clean whatever filtering system several times in order for it to be able to clear the water.

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It got to the point where I was desperate to rid my tank of algae. I have a 25 gallon setup, co2, canister filter, strong LED lights, well established (over 2 years), but always battled algae. I killed the blue green algae with Erythromycin. I eliminated the brown diatom algae with regular pruning and using Seachem PhosGuard in my canister filter off and on. The only thing that remained was a superfluous amount of green brush algae. Each week, I would scrub the glass and desperately try to rid it from every plant, but it kept coming back. I tried adjusting my CO2 (more) and lighting schedule (less) as best as possible, but it wasn't going anywhere. My stats were near perfect near 0 phosphates, 0 nitrate/nitrite, 0 ammonia, 0 pH. My water changes were weekly. My filter media was new (charcoal, purigen, and polishing/pond pads) with a well seasoned bunch of ceramic media at the top.

At first, I thought I was battling black beard algae and due to this I removed all my plants to wash them in a 1:5 diluted solution of Seachem Flourish Excel ("Glut") for 10 minutes. This *did* fix the problem, temporarily, but it also nearly killed my java moss and most of my HC. After a week, however, the green brush algae was back in full force. I was losing hope.

I learned about this product after reading this webpage, which I highly recommend if you are trying to get rid of algae:

The first step to battling algae is to know your enemy. I read more about the uses of Simazine for battling green brush algae and that it was an active ingredient in API's Algae Destroyer. I then read all the reviews of Algae Destroyer and learned this product had caused some very negative experiences! I decided to buy it even though I knew the risks. I was confident in the research that Simazine was the fix and this product had it. What wasn't clear was the proper dosage.

The dosage on the bottle recommends 14 drops per 10 US Gallons. I decided to start with 14, which is less than half the recommended dosage. It seems most people reviewing this product have either not read the instructions fully and dosed too much, or perhaps the proper dosage was too much stress on their fish. Or, perhaps the proper dosage DID kill the algae, but the bacteria which then break down the dead algae consumed all the O2 in the water which could be attributed to poor filtration? In any case, I'd recommend starting with a low dose, monitor closely, and then increase it slowly.

After 24 hours with a half dose, I was already seeing some of the green brush algae particularly on the leaves near the top of the tank had turned a silver/gray color indicating it had died. None of the plants, fish, or nerite snails seemed to have noticed! I cleaned the tank glass, tubes, filter media, and did a partial water change. I then proceeded to continue dosing 20 drops a day (directly into the water stream from the filter), once a day for the next 3 days. I'm happy to say the glass has remained 99% algae free (little bit at the bottom of the tank might have forgotten to clean it the first time). The leaves are MUCH better most of them still have gray hairs on them, but the vast majority have lost all green brush algae. I plan to wait a few days to let the tank consume all this dead algae and continue again with another round next week. While the story isn't complete yet, I feel confident enough to say I'd fully recommend this product if you know what algae you are battling and you start with a reduced dosing schedule.