Ive raised several leos feeding them mainly tiny mealworms and they turned out fine. I would still occasionally feed some crickets though. Unlike snakes being fine eating just mice or rats most lizards really benefit from eating a variety of different insects.(roaches, waxworms, silkworms, ect) The main thing with mealworms is MAKE SURE they are the right size! Impaction is a big problem with meal worms. Its better to feed a bunch that look to small that 2 or 3 big ones. hope this helps.