ur snake in the water bowl is sign that it is stressed and needs a proper hide. u can use just about anything so finding one shouldnt be that hard. as for the snake in the bigger tank, if it is fine and doesnt seem stressed out in the big cage then leave it be. try putting more water bowls in there or a humid hide to help with the humidity and shedding. do u use a UTH or light, cuz a light will suck up all ur humidity. and good job separating them. they dont like being together and will compete for better hides or warmth or food.