Why White Cloud minnows with Goldfish?

They both do well at the same water temperature is normally why they are kept together. There are some goldfish that will munch them but normally they get along fine. Goldfish are more salad and bug eaters.

Someone is always wanting to add another species to a Goldfish tank and another "cold water" type that seems to come readily to mind is White Cloud Mountain Minnows. WCMM are a really neat fish but Goldfish should probably be kept by themselves. Snails maybe but anything else is not advised.

Even though a lot of sources say its fine for WCMM to be with goldfish. I would not advise it, goldfish produce a lot of waste. I rather keep my WCMM in a fairly tropical tank.

They do great if the tank is large enough, they have enough numbers and room to school, and you feed them on opposite sides of the tank from the goldfish. You will not get any fry from them as the goldfish will eat all the eggs.

Goldfish do not produce anymore waste than comparable fish of the same size (key emphasis on size). You just have to be sure not to overstock the tank and the waste level is not an issue.

Can't remember where I read it in these forums but there was a good post about common myths and gold fish. One being cold water vs. thriving at tropical temps...found it,

http://www.aquariacentral.com/forums/showthread.php?t=172935