thats all i use and the only problem i ever have is when Cooper is running back and forth to get someones attention and he will get it in his water dish. thats pretty messy so i moved it to another corner cause he onlys runs in the front of his habitat and that solved the problem for the most part. and i feed him on a dish so he dont eat any of the coir.
I have used it for years prior to my sulcatas going outside and never had an issue. Like any substrate there will be some things to work around. Just do what other have said and feed on a dish or other items to avoid them tracking the coir into there food.
I have my box turtle's on plain dirt with moss on top of that and because they like the dig down into the dirt I am always changing out there food and water bowl because they get the dirt ever where but no biggy easy thing to do...
I keep a piece of slate down and than put the lid/dish for food on that so they track some of the coco off. I also keep a small paint brush and squirt bottle to dust things off and keep things wet.
I also had the water bowl in a travel zone and what a mess, moved it away from the "sidewalk" and now it stays reasonably clean for the day.
Thats All That I Use With My Sullie, Its Great And Holds In Moisture
Just Make Sure You Have About 3-4 inches of it ay\t least so he can burrow and get comfy
Sorry for stealing ur thread what about cypress mulch I use it in all my other reptiles right now is it ok to use for sullys or should just go with Co Co coir