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A betta would survive, but not thrive. They are very lethargic in cold water and I highly recommend having a heater and filter with them. It's a common misconception that Bettas do great in 'bowl' environments, when they really don't. Consider getting a paradise fish. Similar to a Betta (albeit not as colorful) but if you're really wanting a fish in there, they would be a better option.
 

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Nerite snails are best for cold water tanks. Plus they do an awesome job.
 

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I'm almost afraid to start with nerites. I already have two snail tanks plus two jars full of bladder, pond and a few unidentified small snails. If I bring another breed into the house next thing I know I'll hear pleas of "can we get this other color too?" and "can we hatch the clutches and keep them, mommy?". :icon_eek:
Haha yeah kids make it difficult to 'rehome' sometimes. Nerites however need brackish water to breed so they don't reproduce in your tank. Plus they do an awesome job :)
 
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