I have two baby sulcata tortoises. The pet store I got them from recommended I use sand as a substrate. Though I haven't had any issues yet I researched and found that sand is quite bad for them. So I already have some Eco earth and bed a beast to put in asap. But any other suggestions are welcomed! I also heard a constant humidity is bad for them and causes respiratory problems. So my question is, how can I switch them to the correct substrate without raising the humidity too much? Thanks in advance!!