Bettas may be technically considered tropical, but most Bettas do not live in heated tanks. If a betta gets cold he is less active, but it's not deadly like with tropical fish. They do prefer warmer water but they can live in unheated tanks, unlike other tropicals. As for the betta eating the food before the goldfish, it depends on the Betta. Mine liked to circle his food and then "kill" it. The goldfish would eat everythign before he even had a chance, I had to make him a special place to eat to make sure he got enough food.
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