This stuff was very helpful in stopping the seaweed outbreak in my 34 gallon cube with 20 gallon pan. Ammonia, nitrite and nitrate were 0 and phosphate was barely above 0. I don't have a phosphate test so all I can say is that the color is slightly off the 0ppm reading. The next gradient is 5 ppm. Place this substance in the bag provided and hang it on the outlet of my skimmer. After about a week, the brown algae were gone.
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