So I found a 3 gallon bowl lying around in my garage for YEARSSsssss now and I'm planning to put a betta in it. Since its been sitting around doing nothing all these years, I'm really concerned about how to clean and disinfect this bowl of anything and everything before I put my betta in there. Any suggestions? Or is rinsing the only thing I can do? Hot water? Any cleaners?
Also, is lighting absolutely necessary for the betta at night when the lights are out? Or is it just for aesthetic purposes?