I have had my white's tree frog since last spring. He is about medium sized for a white's, he's grown since I bought him. He was a typical greedy eater until recently, and now I'm getting worried.

He is an exoterra terrarium (12x12x24). The bottom is flooded and one half is covered with gravel and coconut fiber in which various live plants are rooted. He has climbing vines and several ledges. The room temperature is kept at 21 C at all times, during the day a full spectrum day lamp and heat bulb are also on, which brings the temp up to about 26 C. The humidity is fairly steady around 65-75%.

He spends his days in a planted ledge I have, hiding underneath the plant leaves, and then comes out when it's dark. I typically feed him every 3-4 days, with 4-5 large crickets, a hornworm or an earthworm. I dust with calcium once per week and vitamins once as well.

Usually he is a great eater. He would eat his food as soon as he noticed it, within a few minutes. But over the past month or so he doesn't appear to be eating - or at least not successfully. I have been finding his food alive or drowned in his water in the morning. At first I thought maybe he was just having some bad luck with catching it or was knocking it down into the water, but it is happening too consistently now. I am starting to think he hasn't eaten in a month or so, except maybe a few crickets. I did check on him last week after feeding him crickets and found him sitting in his pool, which was a first. I assumed he'd chased a cricket down there, but wasn't sure. I like to leave him in peace in the dark while he eats so I didn't see what had happened. But I didn't see him actually eat anything.

I put a hornworm in two nights ago and found it on his plant in the morning, alive. I took it out and put it in again last night, making sure that he was up and awake before I did so - he was. He looked fine. But this morning I found the worm drowned in his water pool.

I am wondering if this could be to do with the winter? The room is cooler than usual and of course there is less daily light, could that be influencing his feeding and activity level? Also, before this issue came up I gave him a very large hornworm and I'm wondering if it was a bad experience and my have made him not want them anymore? Does that happen? I hadn't realized how large it was until I put it in the tank, but as I tried to get it out again he pounced and ate it, but it was a struggle for him. He did poo the following day so I assumed all was well.

Any advice would be appreciated.