I've had some that stayed brown for a long time, then slowly changed to orange. Usually, the brown concentrates and recedes until it is limited to the tips of the fins and a very funny moustache. That goes away too. Mine also grow quite large. I recently lost a fantail whose body was larger than a golf ball. It was a very sad loss.
Say, Lucia, would you happen to know if goldfish can get bubbles in their fins? Mine seem to have that problem.
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