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Discussion Starter · #1 ·

I am a new Oscar owner. My husband set up a 90 gallon for two male oscars (each about 9 inches long). We've had them for about two weeks. About 3 days ago, I noticed a faint white mark on one of them. The next day, it had grown to the size of a dime, with the whiteness concentrated around the edges. The original mark is now surrounded by smaller ones.

Has anyone seen this before? Can you advise as to the proper treatment? We have been fighting ammonia buildup, but check it several times daily and have been doing appropriate water changes and treatments to get it under control.


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