I think before you worry about substrate you need to make sure your mite problem is fully taken care of. 3 weeks is too soon to switch to substrate again. Mites are nasty creatures and you want to make sure they and their eggs are fully eradicated before doing so. Best to be persistent and keep treating until it's been at least 2-3 months without any problems. It would really suck if you thought you were safe and end up with another infestation
Heres a more in depth read about their life cycle:http://vpi.com/publications/the_life...of_snake_mites
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