Ouch! Poor little fella. Thank you for helping him. It's sure a dandy. You are doing a great job!

Sorry I didn't see this post sooner. I sometimes miss a few on my work days.

Grif has given you wonderful advice! The dead tissues will darken and fall off. The neosporin will help prevent infection and keep the healthy skin soft so it can grow together. The wound is large in comparison to his size, so it will take a while to grow across. The pedialyte soaks are perfect because he will lose a lot of electrolytes through the seeping of the wound. The two number one treatments of burns are preventing infection and electrolyte replacement.

The wound inflammation is what you are seeing along the edges. It is very likely infected but can continue to heal from the inside out if you can keep him from going septic. Infected wounds are best healed from the inside out to provide constant cleaning as they close. You are doing a great job because he hasn't gone septic, though the odds were high given the depth and size of the wound. If you had not found him when you did he would have died in about 2 days. Though his wounds are severe, you have thus far saved him .

My only other recommendation is to spray and wipe down the sides and floor of the tank daily with dechlorinated water and dry with paper towels prior to putting his paper towel floor down. Mist him twice a day with the dechlor water so he stays moist, and like Grif said, keep him in a warm room at at least 75 degrees. Their bodies cannot warm up like us and the cold will slow down their metabolism and healing.

I'll try and think of anything more to add but at this time that is all that is coming to me.

Great job!!!!