Alright, so I am a newbie at fish. Earlier today, I bought a Baby Betta from PetsMart. I have it in a plastic cube thing, that is ment to be "showy". I don't own a heater, but our house is generally around 78-80 degrees, so would one be neccisary? The tank is half a gallon (I think). I would like to buy a 10 gallon or a 2.5. I have a filter, but it's ment for larger tanks so I do not think it would work with the 2.5. Should I get a heater? As of now, I'm feeding it "TetraBetta Floating Mini Pellets". I want to make sure the Betta likes a happy life, but I don't want to break the bank. If there is any referance threads anyone reccomends, please point me to them. Thank you!