Just wanted to make a note about this acclimation post. It advises you to adjust the pH levels.
I've been advised by other members not to use the pH Up or pH down solutions!! Adjusting the pH levels can be even more dangerous to your little buddy! I was disappointed when I first got my tank and checked the pH (it was at 7.6). I was told to let my betta adjust himself to the pH levels, because they will end up adjusting. As long as the pH isn't around 6 or 8.
Actually, I ended up buying some small live water plants (Anubias nana, Crypts, and a Moss Ball) and when I checked the pH today, it was exactly at 7.0!! Perfect! If you feel the need to adjust the pH, try throwing a little plant in! I only have a small 2.5 gal and they all fit well.