Thanks for the response. No, the betta isn't flicking. I'll post the water stats tommorow (I have to go to Petsmart to get a sample tested). Also, I forgot to mention that his tank is new; he's been cycling it for 12 days. I did a water change on days 8 and 10 (at the suggestion of fish...
Six weeks ago I bought a betta from Petsmart. All was well until a week ago, when he started turing white under his head and along his sides. It's kind of flaky or crusty looking (not cottony, I don't think). taking Petsmart's advice, gave him Melafix, though that didn't seem to do anything...