[cypher]

Around 20% should be fine for the first six months, after that a little less 18-19% until they begin to age when it can even be a little less than that.
Not all syrians enjoy mealworms or other insects but if yours does then one or two mealworms a day is ok but they are high in fat too, plain cooked chicken or tofu are the best low fat forms of additional protein, you can also give a tiny bit of plain cooked egg too & nuts are high in protein & other essential nutrients so for a syrian a walnut or other nut a week would be fine, any extras like sunflower or pumpkin seeds will also be adding more protein to your hams overall diet so most probably get more than enough once you include treats!