I wouldn't use substrate from outside without sterilizing it, same with branches and rocks, you never know what might be out there that your captive bred exotics are not equipped to handle.
play sand usually passes just fine if they do happen to swallow a bit of if your temperatures are right...when geckos get impacted from sand it's because they didn't have a high enough basking spot to aid their digestion.
don't recall if i mentioned calci sand earlier but it is worth knowing about....
Calci sand is horrid.... it CAN be used successfully but it's just over all bad substrate. it is usually a more coarse grain than play sand and tends to clump with minimal moisture. Also I have recently researched and discovered it is made with calcium carbonate...which is an antacid... meaning that it neutralizes stomach acids which severely impairs the geckos digestive system, if they eat to much of it.. it will basically stop the stomach entirely from doing what it's supposed to do which is why it is so well known for causing impaction.
play sand usually passes just fine if they do happen to swallow a bit of if your temperatures are right...when geckos get impacted from sand it's because they didn't have a high enough basking spot to aid their digestion.
don't recall if i mentioned calci sand earlier but it is worth knowing about....
Calci sand is horrid.... it CAN be used successfully but it's just over all bad substrate. it is usually a more coarse grain than play sand and tends to clump with minimal moisture. Also I have recently researched and discovered it is made with calcium carbonate...which is an antacid... meaning that it neutralizes stomach acids which severely impairs the geckos digestive system, if they eat to much of it.. it will basically stop the stomach entirely from doing what it's supposed to do which is why it is so well known for causing impaction.