Hello,

I have been a lurker here for a long time and currently have 4 healthy
goldfish.

Concerns,

1. Water Quality
2. Water Quality, and uh, I think you might have heard this before...
3. Water Quality
4. I would say disease, but I have found that with good Water Quality, you
can avoid many diseases.

The only problem here is that there are 100's of things that effect water
quality. From all that I have read here one huge one is to get a tank that
is big enough to support your fish. If you want one fish, get a 10 gallon
(or bigger) tank. If you want more fish, get a bigger tank.

Walter