If the diet you're feeding is rounded, you shouldn't need to add any additional supplements. Most of the time it isn't recommended to add supplements, as they can throw the diet off. Though, you may want to search the instant HPW here on the forums and see if it is a good diet or not. It isn't one that is highly spoken of, so it really can't hurt to look into it more.
Also, don't microwave it. Just let it thaw at room temperature. You can put it in the cage frozen, too, and the gliders will eat it as it thaws.