I have one female housed in a 2.5 gallon tank... she spends a lot of time sitting around or floating in one spot. At first I thought maybe she was ill... but the water testing is all good and she is eating normal. She has bursts of energy when she wants to... especially when she sees me coming close or when I open the food door. She has two live plants and a floating betta log - its a hex-shaped tank (cycled &filtered & heated). I never had a female before, so I wonder if she is bored? Would she be better off in a bigger tank with other females? I am not sure what is considered normal for females...