I've just discovered wood mites in my sub-adult and adult racks, so I'm assuming they're coming from my main source. I've been using lignocel for around 8 months and this is the first time I've ever had mites of any kind. I'd like to change to a non-wood substrate to prevent them coming back as I know they aren't harmful to snakes but I don't like the thought of them being on my snakes. Any suggestions for an alternative substrate that won't harbour wood mites and also won't cause impaction if my snakes swallow some while feeding?