I'm looking into different types of substrates for my gecko to use and I was wondering about what you think of aspen? I've read some places that it can cause impaction but other places say that it is soft and can pass through the digestive system with ease. I have a calcium dish and worm dish for her so (besides crickets every now and then) there isn't much reason for her to digest it. What do you think? I've heard of all the possible substrates and would prefer your opinion on aspen over a recommendation of a different substrate. Gracias!