I don't find it necessary. I just feed veg scraps from the kitchen and leftover salads as you're doing. Just stuff that I'd feed directly to my dragon. Sometimes I add things like bread slices and orange slices which they seem to like a lot too. Some people like to add the chow to add grain/protein and that works well for them too. It's OK to keep doing what you're doing though.
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!