In article ,
wrote:

the siamese dolls do indeed stay small. I put them out in my pond and they
live 4
years, but never grew much over 2.5-3 inches. Ingrid

If they only grew that big in a pond, I'm betting I can count on them to
stay even smaller than that in my 15H tank. I do have a larger, 40H,
tank, but that one is not for goldfish.

Never having had a fancy goldfish before, I must say I find the way
these fan-tail types, with the caudal fin horizontal to the body, swim
fascinating. At first after acclimation to my tank, it appeared to me
they coudn't really swim very well (the way some poor inbred goldfish
cannot, or can't see, ugh), but it now appears they can swim very very
swiftly when they want to, and in fact they can do some pretty crazy
maneuvering. They can swim straight backwards, I mean straight. They
frequently will do acrobatic twists and turns while lollygagging around
the tank. Sometimes they look a lot like birds swimming in water. :-)