I don't have a lot of room for a large tank where I live so I am gonna get one around 2 gallons. I'm also planning on changing the water myself by just keeping some and adding the new water. Good idea with the towel though I think I'll do that. I was thinking of getting a thermometer, but using the one in the tank is also a good idea.
One other question though. If I use tank conditioner how quickly does that work? Also I was told that the water needs to be oxygenated by letting it sit, but then again bettas have to breathe from the surface so maybe it doesn't matter.
Thanks for replies guys!