QUOTE(FishFace @ Mar 28 2004, 02:27 PM)
You should never mix tropicals with coldwater....That includes PLECOS, OTOS,anf Loaches.
The tetras would definately be eaten.
I don't know what you're basing that information on. You're just wrong. You just named everything on Koko's compatible fish page. Everything on there is tropical or sub tropical.
The CORRECT statement is tropical fish should not be kept in an unheated tank.
All of the fish on the compatible fish page can live fine in 74-78°F, as can goldfish. As long as the tank is heated and regulated at this temperature, they'll do fine. Fantail goldfish in fact are not as hardy in very cold water as their common counterparts, and it's recommended they be kept in a heated tank.
If what you're saying is true, all of the tropical fish in many a member's goldfish tanks should be dead.