cute pics. if your 2 girls are significantly different in size you should separate them until they are closer to the same size because you are right, the larger one will dominate the smaller one and get more food and first rights to warm/cool hides, etc. i've never tried any non-live food with my leos and i'm not sure that they would easily take it. mealworms are basically food right out of the cup like that stuff so i'd stick with those and whatever other insects you might choose.