Hello and welcome to FF ! Myself do not keep White's; but will try to help. First you need to read this: Frog Forum - White's Tree Frog Care - Litoria caerulea. As you see; need to bring the temperature up and provide a basking spot with 85F during the day. Can use a day light for that or and/or a low UV type bulb (2-5 tropical, not desert). Night temps can drop to 75F or so.
Your frog could be sick or very stressed out . Couple things you can do is to prepare a hospital like enclosure and separate from other frog to try and prevent second one getting sick. These two frogs should not have been mixed without proper quarantine. Also, could take frog to herp vet or at least get a fecal analysis done (Arav and Herp Vet Connection). If your frog has protozoan or worm parasites a vet prescription will be required.
A bath in a solution of 10% unflavored Pedialyte or similar baby electrolyte and 90% 80F dechlorinated tap for 20 minutes can help rehydrate and energize frog to get it eating again. Can use a small critter keeper or plastic bowl with holed up top filled to frogs chin level for the bath. Use a towel to drape over it and help retain heat. When done, return frog to enclosure and try feeding it gut loaded (carrots, lettuce, and cherios cereal for 24-48 hours) crickets that are sized same as distance between frogs eyes.
Need to supplement the crickets with CA and vitamins for both frogs, more info on that in here: http://www.frogforum.net/food-feeder...schedules.html. Also, dusting the sick frog's food with Fluker's Repta Boost will help it recover and get some needed nutrient into it. Try dusting it's food with it for a week once eating. Force feeding can be stressful to both frog and yourself. If it get's to that; search in YouTube for videos on how to and dust food with Repta Boost.
Answering the below posted questions will help us identify any other issues going on. Thanks and good luck !
“Trouble in the Frog Enclosure”
The following information will be very helpful if provided when requesting assistance with either your frog or enclosure. To help with your questions, please utilize the below list and post the information in the proper forum area to get advice from FF members that keep the same frog. This will allow for little confusion and a faster more informed response.
1. Size of enclosure
2. # of inhabitants - specifically other frogs and size differences
3. Humidity
4. Temperature
5. Water - type - for both misting and soaking dish
6. Materials used for substrate
7. Enclosure set up i.e. plants (live or artificial), wood, bark and other materials.
- How were things prepared prior to being put into the viv.
8. Main food source
9. Vitamins and calcium? (how often)
10. Lighting
11. What is being used to maintain the temperature of the enclosure
12. When is the last time he/she ate
13. Have you found poop lately
14. A pic would be helpful including frog and enclosure (any including cell phone pic is fine)
15. Describe frog's symptoms and/or recent physical changes; to include it's ventral/belly area.
16. How old is the frog
17. How long have you owned him/her
18. Is the frog wild caught or captive bred
19. Frog food- how often and if it is diverse, what other feeders are used as treats
20. How often the frog is handled
21. Is the enclosure kept in a high or low traffic area
22. Describe enclosure maintenance (water changes, cleaning, etc)
by Lynn(Flybyferns) and GrifTheGreat.