My brother has a betta fish and when he moved in the betta fish with in the vase I moved the betta to a 1.7 gallon bowl and now I want to upgrade him again. He's currently been without a filter and a heater for months and now that it's getting cold his water is cold and I want to know what's the best way to move him into his new tank with a heater. Do I let the heater run in the new tank and warm up the water or do I make the water in his new tank the same as the water currently in his bowl and turn the heater on when I put him in there so it gradually warm up?
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