Thank you for waiting. I suspect you got your information on care from a pet store. Most people do. While we should be able to rely on such information, unfortunately, it is often wrong. They sell people the wrong lighting, advise the wrong foods, and often don't know the correct temperatures for the various reptiles. After months or years of things not being quite right, the animal becomes ill. Almost everything you have been told is wrong, and i suspect that is why Roy is having so much trouble. Even though you have been trying so hard to keep her healthy, when you didn't have correct information to begin with, things are going wrong. I'm going to give you some measures to take.
As a first aid measure, Buy an electrolyte solution.In the UK, it would be a product called Lectaid, which is sold in pet stores. Prepare a shallow bath consisting of 1/2 water and 1/2 Lectaid. Stir in a big spoonful of calcium powder. Soak Roy for about 20 to 30 minutes twice a day. Reptiles can absorb the electrolytes and fluids through their vents (where droppings pass out), so make the water deep enough to cover the vent. Be sure to supervise closely.
Roy has symptoms of Metabolic Bone Disease. It can take years for MBD to progress to the point where it causes symptoms, and once it does, it's very difficult to treat. MBD can result form too little vitamin D, lack of calcium, too much phosphorus, or an imbalance of these and other nutrients. The most common cause is a lack of UVB light. Most reflector lights do not provide UVB. UVB output/size is measured in percent output, such as 10.0, not watts. It's extremely important that you buy an additional light that produces UVB rays. A Reptisun 10.0 is a good brand that does. If you choose another brand be absolutely certain it provides UVB rays. Don't take the word of pet store personnel, but read it for yourself. Full-spectrum, DayGlo, daylight, UV, and UVA are NOT the same thing. I'm putting a lot of emphasis on this because it's crucial to a reptile’s health. Without this light, Metabolic Bone Disease (MBD) will develop because they won't be able to produce vitamin D. Vitamin supplements are not a good replacement for the proper lighting. MBD causes a very slow and painful death. UVB bulbs must be replaced every six months as they lose their effectiveness after that, even though they may still look fine. Light that comes through a window isn't sufficient because the glass filters out the UVB rays. It's also essential that Ray be given a calcium supplement. His prey insects should be dusted with plain (that means no vitamin D3 or phosphorus) calcium powder .
You have been given incorrect information on temperature. At 80*F, the cage is cold, and that alone will result in illness. Chameleons are adaptable to temperature extremes in their wild habitat, but there they can move around to find warmer or cooler spots. In a cage they have no choice. After months of being too cold, illness often develops. The coldest part of the cage should be 82.5*F. There should be a warm basking area that is kept at 89*F to 113*F. That sounds hot to us, but to a chameleon, it is just right. at night the temperature can be allowed to drop to 72*F to 79*F. Use a good digital probe thermometer to measure the temperature. You can adjust the temperature by raising or lowering the fixture or by changing the bulb to one with higher or lower wattage. If you have to lower the fixture, don't put it so low that your chameleon can touch it and be burned. I suggest that you read the information on this site for more advice on care:http://www.kingsnake.com/rockymountain/RMHPages/RMHveiled.htm
Prey should be dusted in plain calcium powder. Chameleons also need plant foods. One of the easiest ways to provide them is to grow live plants in the cage. Live plants also keep the humidity level up. This site has lists of safe and unsafe plants:http://www.anapsid.org/resources/plants2.html
You can also feed collard greens and other purchased greens. This site has great information on what vegetables to feed, and how often:http://www.repticzone.com/articles/lettuceandleavesstaples.html
Finally, you should make an appointment with a reptile vet. The vet can make a certain diagnosis of the problem, which of course is impossible with only an online description. Then, if MBD is present, the damage will have to be assessed, followed by proper treatment. If it turns out MBD is not the problem, the vet will be able to determine what is wrong, and treat that. This link will take you to a directory of UK reptile vets:http://www.livefoods.co.uk/vets.php
Once a chameleon gets sick, it almost never recovers without veterinary care. I recommend that you correct all the conditions in your chameleon's habitat, start giving Lectaid soaks, and schedule a vet appointment.
If you have more questions, just let me know by clicking on REPLY. I hope Roy will reach a full recovery.
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