The problems with maternal incubation is the female won't eat and will rarely leave the eggs to drink. the temp and humidity can be controlled better in an incubator than a tub and the eggs have different requirements than the snake. Eggs need 100% humidity and 89* and the snake needs less humidity and a hotter hot spot. a lot of people have had success maternally incubating but its better and healthier to separate them and get the female eating again and relieve some stress