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I know it will say that about the water level, betta fish do jump though, they can jump up to a foot high, if he sees a fly or a spider or anything near the surface of the water chances are he will try to get at it... its totally up to you though :) just my recommendation
However you DO need a heater, he is a tropical fish, sunlight isnt enough to keep him warm, he needs to be in water that is at least 76 degrees. Again it is totally up to you if you want to get him one or not, but its the best investment you can make for him in my opinion, he will be happier, more active, more colorful, he will live longer and it will decrease his chances of getting sick
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