Both male and female crested geckos reach a moderate size of 4 to 4.5 inches An adult crested gecko should be housed in a 20-gallon tank with screen top.
Crested geckos are personable, low-maintenance pets suitable for novice Adult Size: Crested geckos reach an adult length of 7 to 9 inches.
Size and Age. Crested Geckos can reach up to 7-9 inches as adults, tail included. In the wild, Crested Geckos can lose their tail when feeling.