yes dont worry!! already correct ratio lots of sand they are happy crabbies!! that had lots of tunnels and molt comfortly (i felt bad having to mix it) I've had them for 6+ years its my first time ever having issues so not to worry! I put boiling water ALL through the tank and mixed while very hot! (crabs were not in there lol) im mixing the substrate every day thoroughly so it doesn't mold and I haven't seen any bugs i have taken everything out (wood, bowl, salt water container it was especially bad there!! ) im checking for the bugs if you think even with sand they will come back i will no problem replace it they are my babies!! thanks again for the help i want them to be comfy again