So i got a betta fish today from Petsmart and im worried about him. He looks very healthy and has beautiful skin, gills and he looks generally healthy. What im worried about is that he is kinda shy and he never glares. He will live in a 0.5 gallon tank for a week and then get him a 2 gallon tank. The tank doesn't have a heater but my house stays pretty warm, 75 degrees. He is pretty active though. I've had betta fish before and this has never happened, any thoughts. Thank you guys.