Try fasting him for two days and then give him a very small pinch of flakes. My Betta seems to only go once a week at the most, and it's a large blob not that stringy waste. Don't think that's really normal, guess he gets constiptated, so i've reduced his food. He's a walmart resque too, so who knows how messed up he is, poor thing. I hear that giving the fish half a pea (heat canned or frozen pea for a few seconds then peal off skin and place in tank.) helps with constipation, but use that as a last resort, it may not digest well with all fish.