Yes to back up what protiemama said.. it was most likely not the quality, but the mealworms itself. They aren't ideal for Beardies because they are mostly hard shell, with little meat or nutrition. I believe you said he was 7". Even the small mealworms contain too much shell for a smaller Beardie. As a treat I feed my Beardie who is 13" no more than 2-4 a day. I might just stop altogether now. But for those who do feed mealworms, it's best to feed when the Beardies are larger because their stomachs can contain more where as when they're small, it just blocks up their insides. But as protiemama mentioned, the other worms are much safer and nutrional.
And definitely let us know what kind of UVB it was. ReptiGLO's aren't good. ReptiSUN's are what you want.
And definitely let us know what kind of UVB it was. ReptiGLO's aren't good. ReptiSUN's are what you want.