I use orchid bark myself for my boas, but. I guess reptichip is very similar, I find it's better for keeping humidity and not too dusty
I also use a guarded ceramic at one end on a thermostat to give a nice thermal gradient so they can thermo regulate there selves, normally 32c warm end and around 27c cool end
Hope this helps
I think rhp are more available in the states, I'm in UK and not that easy to get hold of
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