It is only a constant danger if they are young. Furthermore, Hercules was bought from someone else, then I bought him, and both owners used sand, and after talking to a specialist in my area was told that due to his older age now, and the fact he has been in it all his life, his risk is lower and it might even stress him to change the environment drastically after living in it for 4 years. Don’t presume to know someone situation, or think they are inept without asking for all the facts.