Yeah , the more information the better and photos are worth a thousand words (?apparently lol ) ..
Well I'd deffo cover the back and sides as I mentioned before to give some security to him . I'd get two better ( and bigger maybe ) hides unless that's a gigantic coconut shell there no way he can fit in there ( ( is there ?) .... Those Exo-Terra hides ( image below) are very popular and look great as well ..I'd also add a few branches and loads of fake plant foliage ( from a dollar shop) as well - to give extra security it all helps as there's a lot of open space in there at the moment.
Ideally need all the info on the setup now - including the size of heat mat , where its situated , is it regulated by a thermostat . What kind of thermometer are you using to gauge temps ??
As much info as possible really ...
As regards the mice , he will be fine on mice if that's all you can get , in my neck of the woods rats cost about 7 times what mice cost ( comparing same weights ) so I also use mice for my Royals.. if they're obviously still hungry after one they are offered a second ) . I'm guessing you meant 30g mice incidentally ?
Sent from my iPad using Tapatalk Pro