Great Gray Tree frog

This is a massive Great Gray Tree frog. I got him from my work, paid £15. He lives on his own in a 20 gallon tank. He did have a mate, unfortunatley she died. She was very skinny when i bought, but i thought i may be able to help. I thinkit was too late. :( He loves his mealworms, crickets and waxies. I can hand feed him no probs