Bruh, acifexeq, ur makin more work for yourself. If your tank is sealed good, then there no chance of bugs escaping. You wont notice the bugs at all, trust me. (Also earthworms give a natural prey to the lizard and pill bugs are cute)

As for parasites, this bioactive substrate has been proven to be cleaner than dirt without a cleanup crew. Read up on the bioactive subtrate page on varanustalk.