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Algae problems in an aquarium can never be traced to just one factor or general condition, and instead, are always the result of a combination of different factors, which include light, fertilization, water changes – specifically, how often and how much – feeding, fish population and, of course, the specific water parameters. _x000D_ _x000D_ According to analyses that were performed over a course of a number of years, red algae, at least the common brush algae and beard algae, occur in descending order at the following parameters: _x000D_ _x000D_ 1) too little carbon dioxide (in relationship to 100 % of the measured tank); the pH level should be in the slightly acetic range, depending on the carbonate hardness, in every case. _x000D_ 2) elevated phosphate levels (over 90 %); phosphate limitation by means of JBL PhosEx ultra is often helpful here. _x000D_ 3) too little and too irregular fertilization (there should always be traces of iron at least). _x000D_ 4) insufficient water changes; a weekly water change of over 30 % is recommended for algae problems. _x000D_ 5) not enough fast-growing plants._x000D_
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