Why is my red cap goldfish turning pink?

I have two young redcap goldfish that I just got about 5 days ago. One of them is narrow and silver and healthy but the other, I believe a female is fatter and turning pink, why? I put them both in medication (methylene blue) over night and did a 100 percent water change.
I have a ten gallon tank and will be upgrading it but can only when she is healthier because if she is sick i don’t want to spend 0 if she’s too sick or something.

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2 Responses to “Why is my red cap goldfish turning pink?”

  1. Ben kanda Says:
    January 24th, 2010 at 12:21

    Whats happing is that belive it or not a goldfish changes gender in the middle of its life nowif it is more red than it is a male if it is more pink its a femle. The procese ts going through right now is its changing gender, and is not sick

  2. natkhat007 Says:
    January 24th, 2010 at 12:21

    is she active r not???watch tha first sometimes they even change colour due to change in temperature .keep an observation. try to keep the temperature constant. temperature plays d main role in maintaining fishes health. is d colour aroung its eyes changing to. and r the scales being shattered too?if it is then dont spend on it its sick i guess. hope she gets well soon.