These are the little guys I share my desk with - they are White Cloud Mountain Minnows - or their scientific name, Tanichthys albonubes.

They're a very cute and inquisitive cold water fish, and I often recommend them to friends starting out with fish. They are hardy, and require much less filtration and a much smaller tank than goldfish.

I have both the normal and gold variants in this tank, and am keeping my eye out for the long-finned variety also.