API POND ALGAEFIX (8 fl oz) Pond Algae Control - Copper Free - Clean, Clear Water - Up to 2400 Gallons - Safe for Fish & Plants - Water Gardens & Fountains - Natural Active Ingredient - EPA-Registered

This stuff is amazing! I have a 40 gallon freshwater tank with lots of tropical fish in it. My tank is well established, but I've been having some issues with algae growing on the tank decorations and on the glass. I do water changes about once a week, I also have a very good quality canister filter. But managing the growth of algae was a major problem. So I bought a bottle of the Algaefix and I used exact as directed on the bottle. Within a few hours my tank was crystal clear. I couldn't believe how fast and efficiently it worked. I'm happy to report that all of my fish are doing very well. This product did not harm them at all. I definitely recommend this to anyone who's having an issue with too much algae growth, just be sure and follow the directions on the amount to use.

This really works because I pour a lot into the pond with out of control algae growth. I didn't even read the instruction, just dumped a cup or two. The algae turned brown and completely stopped. I haven't seen any more growing since about a month after using the product. Two weeks after, I added some fish in there and they are OK.

Works better than any other product I've tried to control various forms of algae in a 3000 gallon pond. Water gets and stays clearer than I've seen it previously when using other algae control products. I don't have any fish to be concerned about but it hasn't harmed any of the water lilies or other pond plants. Only downside is for me it can be a bit expensive if I use as much as the directions say every week, so I'll often stretch out the applications to a lesser frequent schedule and I've found a frequency that works well for my situation.

If you are having major string algae problems - read here! We own a 2000 gallon multi-waterfall pond that sits in direct sun in the front yard. The last 2 years we've been in the house, we've battled with constant string algae. The previous owners had the same issues. If you use Algaefix IN CONJUNCTION with Biosafe GreenClean (another product) you will have awesome results. First thing - everything with string algae is about prevention. Once the "bomb" has started and left un-checked it is extremely difficult to slow down and stop. This product WILL NOT kill and control algae once "the bomb" has started. Well, it might if you dump the whole bottle in per treatment, but that's a lot of money! The hotter it is, the sunnier it is, the worse off you'll be. Your prevention starts in spring. 1st, do a major water change in the pond - I recommend a minimum of 50% if possible. Once changed, begin treating the pond for the first week with Algaefix every 3 days - then after the 1st week, back up to once a week. I recommend the big bottle. You'll need it. The one thing Algaefix does an AMAZING job on is suspended algae (green water) and water clarity. After the first 2 treatments you'll notice crystal clear water. As the dog days of summer approach, you will start to have small patches of string algae appear, here and there. These spots get treated directly with Biosafe GreenClean (see my very-similiar GreenClean review). It will dislodge the algae and make it float, and a simple pool-net (also a handy must-have) will remove it easily. So far this summer, my pond is crystal clear, with very little maintaining at all, where last year, I was literally pulling out 4-5, 5 gallon buckets of green slop every week. Stay on top of it early, and use both products - Algaefix as a constant-maintainer, and sprinkle in GreenClean directly on top of all spots where you see algae beginning to form!

Great product, cleared my pound of an insane amount of hair algae in 3 days. Water lilies and fish show no signs of stress.

It took a year to remove the Algae. The water is currently clear. I did add chlorine tablets to the water.

Works great! This has been the best solution to the algae in my pond and on the rocks in my waterfall without harming my fish! Highly satisfied!

I've been using this product for years now - I had it on subscription so it sent me a bottle every 6 months. It was all fine until this latest bottle. I put it in a tank and it killed 5 fish. Thinking I may have just mixed up the dosage, when I used it again, I was super careful about dosage. If I didn't notice them acting funny a moment too late and pulled them out and gave them fresh water, another 5 would have died. There was a very strong filter with waterfalls and airs stones, so it wasn't oxygen deprivation. Again, I thought maybe it was just too concentrated for aquariums, so I kept the bottle. I put the baby koi I had in the aquarium out in the pond. There was a lot of algae so I put in the dosage required. It killed one of my adult fish that I've had for years and 3 of my 5 babies. The other two are not out of the woods yet and I've done 2 water changes and its been 3 days and I'm worried about my other adult fish. I was hoping for mating this year, but I doubt they will be able to because they are so close to death. All my mosquito fish except 5 (out of about 1000) have died. Again, this is not about oxygen deprivation, they aren't gasping at the surface. they flash, then die at the bottom of the pond. They won't even float after the death. I don't know what was wrong with the bottle, but don't trust this product. If its bad, it will kill everything and I'm so horrified to loose all my fish. I've been having nightmares and its just awful. DO NOT BUY THIS PRODUCT!! Edit: contacting the manufacturer does nothing either. They won't answer their phone and won't reply if you leave a message. They send a sweet little "call this number" email to every negative review, but apparently won't actually do anything about it. Terrible customer service. I refuse to buy any products by them now. Edit #2: So, I realized that I miscalculated the pond size and thought it was half the volume it actually was. So I was putting in half the recommended dose and it STILL killed my fish

excellent

It works but expensive for ponds

It beats buying the smaller bottles.

Amazing results on just two days. Two months of algae bloom due continuous rain and sunny weather. Never experienced this in with my pond before. Fishes could no longer be seen. Fantastic API Algaefix ... My pond is restored to be crystal clear again.

This product works very well. Fish are very happy and I have a beautiful pond once again.