Never really had a prob. with them. However, I have heard if you clean ur tank and put Rid like from wal-mart or whatever. Anyway you put the rid down then ur substrate and spray another layer on top of that it is supose to get "rid"(lol) of them safley. Like I said never had to use it but if this information IS WRONG please correct me. Don't want to hurt the snake. TY and hope this helps.Good luck! -Ray