No. If you dust your live food 2 or 3 times per week and leave a small cap (from a soda bottle or milk jug) filled with calcium powder in the tank, your gecko should do wonderfully. Geckos know when they need calcium and will lick it from the supply you leave in the cage if they aren't getting enough from your food dusting. It's more likely that they suffer from not enough calcium as opposed to too much.