Let me start by saying...I'm not a big fish person! My goldfish's scales are losing color...some of them have gone from bright orange, to silver/white. Is that normal? Also, he has what looks like a dark red bubble (tumor?) on his side...I've had him for 10 1/2 years. The only other fish I had was also a goldfish...he swam upside down for 3 years with what appeared to be a busted vein in his tail. He was 11 when he finally died...about 8 years ago... So...I obviously don't have a lot of exposure to fish...should I be concerned with this one, at all?