Oops... typo. My last post should read, "I was trying to figure out HOW he could be unhappy, LOL."
Anyways, I agree, my thoughts were the same -- if he were unhappy, I would think he'd be sulking at the bottom or something similar, not swimming around. However, I've never had a betta swim back and forth *that* much, so I figured it warranted asking. Tofu swims around a lot, but it's not that fast, and it's more in a circle (basically, he does laps in his tank). Tuna acts similar as Tofu with the laps. Taco is doing more of a back and forth relay race, LOL.