API Algae Destroyer Advanced, 16-Ounce

I use it in my aquariums, and a fountain in my green house. Works well in both!

I have a problem with the water quality here; it's well water that has problems with high phosphate levels. I attribute that to living in a (largely former) agricultural area...phosphate-based fertilizers. The amount of algae varies directly with the phosphate concentration with little-to-no changes in any other ion concentration.

Anyway, this is the only non-copper containing stuff that works well and consistently. With the other stuff that I bought, I might as well have had the fish swimming in pure algaecide.

In my experience, this manufacturer sells a pretty good product line and I don't know why I didn't start with them.

I do have a phosphate sponge in one of the filters and I have live plants, snails and a fair number of monster Discus. Everybody is doing fine after months of treatment.

Yes, months. It takes a lot to keep the algae at bay and I try to watch how much I feed the crew.

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This product, applied according to instructions (25 drops/ten gallons or 40 liters of water, killed all of my blue eye forktail rainbow fish, Pseudomugil furcatus, within 18 hours, first the females and then the males. None of my other fish have been affected. However, I have not lost any plants to the product. The product is fairly effective against algae, but after the initial kill, it is necessary to continue treating the water weekly.

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This product simply does not work. I used it for three weeks following the instructions and everything remained the same. I have a 20 gallon tropical aquarium and I instead replaced the substrate after giving up with multiple products. I'm not sure if this works with other forms of algae (mine was green)but i'd be hesitant.

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We accidentally did too much of a water change and created an in-balance in our tank due to trying to plan ahead for a vacation. It took awhile to eliminate the green algae and cloudy water bloom but this worked so well we started to use it as a regular with our other tanks. Aerated well and we have had no plant or freshwater fish loss. Sparkling clean tanks. Will recommend and continue to use.