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I have three common goldfish ranging from about 6 inches to about 8 inches (give or take, just estimating size) in a 20 gallon tank with a whisper brand 55 gallon filter. I do 50% water changes once every 2 weeks. I add 1 tablespoon of aquarium salt per 5 gallons. I cleaned my fishtank out, boiling litereally everything before putting it back together (I had a snail breakout) about a week ago. The next day, the middle sized goldfish started getting lighter. about 3 or 4 days later it was completely white, and Im afraid I might have hurt it or something. Its not acting any different, and it still eats with great enthusiasm. Im hoping its nothing but Im really worried, because I have had these fish 2 years, going onto 3 and I have never seen this before. Any body know what it is or if its normal?