All valid points and if it works for you then who am I to refute it
I have seen too many people who use kiln dried pine and had respiratory issues
so I chose and continue to choose to use aspen and incur the added expense.
I breed for pets also, I can't/won't take chances with $15 rats sneezing before they go to their new homes since I give 30 day health guarantees on all my pet rats.
Your completely correct as to their ammonia build up being the biggest cause of respiratory issues,
clean tubs goes a long way towards keeping them healthy.
