At the petsmart near my house, the only snakes housed more than one to an enclosure is corn snakes and I've never seen more than two corn snakes in one enclosure. I've never seen leopard geckos on sand, babies or adults. Yes they use dial gauges and heat bulbs. I use heat bulbs and my humidity and temps are fine. Not all stores are the same. I know reptile loving friends that work at Petco and they will not allow management to skimp if it's hurting the animals. Not all stores are the same.