
The instructions for these tablets were a little skimpy but the rule of thumb is 1 tablet per 10 litres. A few weeks ago, green algae bloomed in my Oscar aquarium, and even after a thorough cleaning, the algae came back. Finally I found these pills and decided to buy. I used a magnetic scraper to clean the existing green stain, then took out the activated carbon portion of my filter and then dropped two tablets into my 20 gallon tank. After 2 days the water became crystal clear and after almost two weeks the algae had completely disappeared from the aquarium. If you have problems with algae, buy it!

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