Leaves from northern trees don't hold up in tropical conditions. I use mainly live oak (You can get this on eBay or from dart frog specific vendors). I like to start my viv's off with a layer of seagrape leaves against the substrate though. It breaks down quickly and microfauna loves it. It's a great way to make sure your springs and isos have food right away. Live oak definitely holds up the longest though.A question about leaf litter: would oak work for it (or any other native trees?) or do I need to purchase specific leaves? I’m in the Appalachian mountains near the border of southern WV/KY.