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When people say they are "off colour" it means they are not feeling well. The same applies to all fish. A fish loosing its colour is a sick fish. My advice is to chech that your water quality is good and that you are following the basic rules below. :- 1 inch of fish needs a minimum of 1 gallon of water. (1 Oscar needs at least 20 gals of water. 2 Oscars 30 gals is OK). :- Every tank needs a permanently running cycled filter. :- Every tank needs to have at least 50% of its water changed every week.

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12y ago
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Q: Why is my Oscar fish losing its color?
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