Quote Originally Posted by Badger View Post
Both play sand and mulch are unsafe, they can cause impaction and kill your frog, the best substrate to use (in my opinion) is coco-fiber (not to be confused with coco-husk). The biggest name brand is Eco-Earth by zoo med.
Sand- True
Mulch- Depends on the mulch

Coco-fiber and coco- husk are the same product. They are just different forms of coir.

As for redwood, never use this stuff. It is OK for orchids, but bad for living animals.

Over on Caudata Culture Articles, I have an article that discusses what wood products are safe to use for amphibians.