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Sorry...should mention levels are ammonia - 0, nitrite - 0 and nitrate < 20 (I know "close to 0" won't cut it with ammonia and nitrites :-) )

Hi All, I have a 90 gallon planted tank that has been up and running for about 2 months. Over the last 4 days or so, I've had a Bosemini Rainbow who has developed a white "spot" toward the tail end of its body. It doesn't appear to be very raised as depending on the light, you can't really see...