As far as substrate, I would recommend Bed-A-Beast (comes in a brick and expands when it gets wet...keeps moisture very well too). With the heat lamp, I would highly recommend that you turn it off at night. I personally prefer heat MATS rather than heat lamps...the heat mats are specific for reptiles/amphibians and won't burn. They go under the tank. You're doing good with the feeding and even keeping the crickets gut-loaded. I have not kept these frogs for myself, but currently work at a reptile store that constantly carries these sweet frogs.