Did you treat the wood before adding it to his enclosure? The best "decor" for a tree frog would not just be sticks and fake plants, but live plants, bamboo, a fake background, etc.
You say your frog got sick, was it a bacterial or fungal infection? If the wood is treated correctly, and the vivarium is maintained, there should only be very limited amounts of mold that grow, and if the vivarium is properly seeded with springtails, they will eat the mold, they are a really helpful insect!
And, what kind of substrate are you keeping him on? In five years you have never maintained the substrate? This could be the cause of your frogs sickness. Do you remove it's feces if any gets on the substrate? All amphibians must be kept moist, they can only live with "dryness" for so long, do you mist it's enclosure?Originally Posted by BeckyM