I moved to Oregon from California. I have trouble finding substrate here that does not have pine or cedar in it. Oregon is a major timber state so I thought it would be easy. So in the 15 years I have lived in Oregon, I have had to travel to Fresno Calif to get substrate. (1600 mi round trip) I have had the same substrate in a few of my indoor habitats the whole time I have lived here. It doesn't hurt anything. You are just wasting substrate by changing it out. I 'spot clean' daily.Oh good thank you. I was worried because I just went through and cleaned and replaced the substrate last Thursday then all of a sudden I get a phone call at work lol. She panics easy and I told her I would make some inquiries. Thanks again?