goldfish "tumors"

[Kate Breimayer <kate@munat.com>]

I have a friend who has 3 large goldfish in a 20 gallon tank. One has 
large lumps on it's fins. They are about the same size as it's eyes and 
it's a big fish. Fins are otherwise in perfect condition on all 3 fish, 
color and appetite are good. Two are the kind with lumpy heads, don't 
know the breed name. Does anyone know if old goldfish are prone to  
tumors? They don't look like parasitic or infectious problems but I 
can't really tell. Was wondering if maybe the gene that causes the head 
to have the lumpy look is prone to getting out of hand... or does anyone 
know any good sites on goldfish? I haven't kept the buggers myself since 
I won some at a fair in 3rd grade, they didn't make it more than a 
couple days so I am definitely not a good resource for my friend. Any 
advice?
I can't get her real motivated on the water change concept so I gave her 
an ammonia test to see where that is at from time to time, but she never 
really does change the water and only one fish is affected so am 
guessing it's not infectious in any major way...
Thanks,
Kate
Oly WA

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