Jellwood, hope you find your way back here...might want to bookmark it..would make us easier to find! <img src="/images/graemlins/wink.gif" alt="" />
No, bettas floating on their side is not very normal..lol..He most likely has a swim bladder problem. This can be caused by constipation which occurs by overfeeding. The other issue could be that his swim bladder never developed properly because of overfeeding as a fry. In the second case there isn't much you can do to solve the problem, but as long as he seems healthy otherwise I wouldn't worry too much, just keep his water good and clean. It isn't painful, just sort of a handicap.
If he is constipated than the solution would be to stop feeding him for a few days, then offer him some bits of cooked frozen pea..and nothing else until he passes the blockage...also, keeping his water good and clean.
HOpe this helps and that you can come back and let us know how it goes. Thanks for stopping by! <img src="/images/graemlins/laugh.gif" alt="" />