I bought a betta fish tonight from Pet Supermarket. I named him Tarzan . He was in the worst condition possible . His entire cup was filled with so much waste that every time he moved it was like a snow globe. All the other bettas looked unhappy but they were in much cleaner water. This guy was swimming in tons of debris and was the happiest little thing. I know some have said it's not good to take home bettas in really dirty cups because they don't last long once home. But this guy was just so happy despite his conditions that I couldn't leave him there. He is in a 2 gallon glass bowl with clean de-chlorinated water, a heater set to 76-78 degrees, and a thermometer. He also has glass marbles for substrate and a plastic betta leaf for resting. There is a lid (with breathing holes) over the bowl so that he does not jump out and he has a light as well. He is very intelligent and active. He is acting very happy to be out of his cup. But I'm wanting to put him in a larger aquarium. I'm thinking of either buying a 5 gallon tank kit or a 10 gallon tank kit. Which one is better? And will he survive the cycling of a new aquarium? Should I keep him in the bowl while it cycles? Any help is appreciated.