This is my setup...i have the 12x12x12 cube tank too and love it...although you will need to cover the screen top some with plastic as too much humidity is lost. I taped a gallon ziplock bag to half the top so only half the screen is exposed now. I no longer have coconut substrate anymore and use peat as recommended by the other frog peeps here. You will want to buy 100% organice peat found at lowes or home depot. Read the label make sure its all peat and no fertilizer in it. It holds the moisture better and doesn't stick to the frogs as bad or their food as bad. Paper towel is a good option for the first week or so but they will want to burrow before long and your gonna need peat. They don't need larger then 10 gallon homes when they are adults. I am not sure where you got that info at. They are lazy frogs and that is the reason 10 gallon is fine. They need temps that graduate from 75-84 degrees and humidity of 70-80% Food use crickets, roaches, superworms, waxworms, and earthworms cut to appropriate size...pinkys and fuzzys or mice should only be done as a treat one time a month. Sure they will grow faster but it effects their liver and they die earlier. Dust with Calcium-d powder every other feeding. They don't need UVA bulbs as it tends to dry them out. They are nocturnal and like to feed at night. I am now in tune to mine...they come out from burrowing when they are hungry. I feed at night as well. No since waking them when its their sleepy time. I would rather have happy frogs then seeing them and messing with them making them unhappy cuz they didn't get their beauty sleep. Anyway Good luck and if you need more help there are lots in the chat that you can chew their ears off and will help in anyway possible. Oh i used for the backdrop the picture that came with my tank. I use it on the outside and it looks awfully pretty and it was cheap. I just have to remove it before cleaning so it doesn't get wet. I tried the heatmat on the side and it wasn't warming it enough so i moved it to the bottom..OMG its on the bottom...lol...yes and its only warm...i do check it daily to be sure its not getting too warm to the touch. That is something you have to just watch. In this tank its just warm is all. I think cuz the bottom is elevated and some of the heat escapes.