Mixing GoldFish and tropical fish

[The-Wolf]

for instance you can mix fancy goldfish with danios and white cloud mountain minnows.

You can mix tropical fish that PREFER coldwater with them, I'm talking about danios,WCMM

Zebra Danios and WCMMS are actually sub-tropical not tropical fish

,
that is why they are, sometimes, kept with goldfish.

Personally I'd never keep goldfish in a tank, they (IMHO) belong in ponds.

 

[Tokis-Phoenix]

even the tap water is about 28 to 30 degrees celcius.

28 to 30 degrees?! Many tropical fish would be uncomfortable at that temp let alone coldwater fish, my tap water comes out at about 18....

 

[Isis_Nebthet]

I've grown out some goldies in my 75. I've got a pretty buff filter system though (5 gallon bucket of floss and a pool pump). I keep the temp 72-75f. I put them out in the pond when they're big enough.