cold water tropical fish

What kind of fish can I put cold water in a tank of 5.5 liters .. non-tropical (unheated)?

I want the fish goldfish eat food other than goldfish. because I bought a huge bottle of food coloring 3 fish I keep goldfish in the tank and he is deceased): My friend told me a hot boiled fish, because a tank is too small 5.5 liter

probably because the bowl is too small and it is not good filter and cleaning. Try a goldfish in his plate and should do much better, but make sure that as you do not have a filter that cleans every day to a day very well!

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