My bull frog is doing great and the toads tank or rub is what I am having difficulty in keeping with the following mould growing in top soil and I onky cleaned a week ago but I was told on here mybe I was using wrong substrates for wrong frog or toad some tanks with proper job done don't have to be cleaned untill every cupole of months like addibg mulch drainage and spring tails wood lice etc to self clean .maybe I could do with more holes in top or I could drill some in side the rub at tge top thecrub is only temporary basis as im having a 3ft by 2ft by 2ft an bull froogs a 2ft cube but they are to small for the toad an frog anyways back to drawing board and I will have to try something else. .!!????! But eco earth seems like the idea substrate mixed with a little top soil and nybe compost or mulch mix with bark an some stones for drainage