My 14 year old pond fish is eating well and seems like a normal fish. However, it has a tumor on its eye. In the past day or two the tumor got a white spot on it. I noticed the eye problem a few weeks ago. Last week it looked like another tumor on its side, which appears to have erupted from its subdermal layer rather than being a pecked spot from a bird or another fish. The other 20 fish are normal, not a mark on them. Pond is 640 gallons, filter cleaned weekly, well established (14 year old) pond.