Many people suggest buying coconut fiber substrate. I do not. As you can see from your picture there are many strands of 'fiber' in the dirt. When your frog decides to eat and misses the target, all of those strands have a chance of becoming impacted in his stomach or wrapping around other stomach contents making it harder to pass. I highly suggest peat moss instead. Retains moisture and has anti-bacterial properties. Lastly, I can't tell from the picture but substrate should be about 4 inches deep.