i had the frog for only about a month i bought it from a local pet store called that fish place it was a young Cuban and he was doing fine till he died iv never had this problem with any other tree frog iv owned and i clean with ether hot water or hot water with a bit of plant basted soap then i rinse it out really well with hot water and i dry out the tank completely i washed the tank the same way before i put him in it the first time when i got him and the only time i use and thing like watered down Clorox is when im pulling a tank out of storage or when an animal was really sick and i need to starliz it before i put it away for the next time but i always rinse the tanks out well before i use them and i use spring water for misting and for the drinking water as for tank size since he was a baby i put him in a 2 1/2 gallon carrying tank it is taller than i is wide iv never used any thing but normal hot water to clean my tanks and all my frogs before him were fine they all purity much died of old age except for two that were African dwarfs and they got sick and died from a strange white mold