Thank you for your valid input im waiting on my tanks being built by a forum's member as it is 3ft by 2ft by 2ft I will do 3 1 ft divides 1 woody 2 rocky sandy 3 water and the substrate I will keep moist and then a drier side I am in process of making up my own substrates from mixture of compost eco earth and bark chips leaf mould stones plant inside mybe top soil just a little an hides as well cork bark you will be impressed how hard im trying