I'm guessing using the wrong substrate and having the wrong temp are the big ones.
I use coconut fibre, but am not sure how often it needs to be changed out, or how damp it should be (damp or wet?)......

I found out the hard way that letting uneaten crickets wander around the frog tank is bad- one tried to chew on my pacmans eye..
Any advice on things NOT to do? Any things you've tried as a frog owner that were a disaster, and didn't work? (such as bugs that are more hassle than they are worth as food, lighting, etc)