Vet immediately. No neo. A large open wound like that 1 will not do well with neo anyways 2 neo will only soften the scales leading to more injury, flaking and infection.
Sounds like you already took the best precautions with changing into papertowels. But youll really need to sterilize, and keep the tank hospital Clean. A couple temp tubs "hospital tubs" might be in order. It'll be easy to clean switching back and forth daily from one to the other. Set them up exactly the same. This will be a hell of alot less stressful than having to clean out a tank daily. At least every other day. It'll be some work but he will heal.
I hope you took the hook out too. He probably was trying to climb and he fell tearing his skin. Ouch!


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