Most goldfish start off brown. They may change colour after a few weeks or several years. Some remain brown for the rest of their life.
Sorry about your fantail.
I lost a beautiful Calico Lionhead a few months ago.
I now have 10 goldfish. 9 of them were unwanted pets, probably because they have grown too big. Some are still growing, I don't know what to do!
They can get bubbles in their fins. I explained how that happens
here. If the excess plants or algae are removed, the bubbles should disappear soon. Are your fish indoors or outdoors?
