Veterinary questions? Ask a Vet for Answers ASAP
Welcome to Just Answer. We are an online advice service. You are through to Dr Coles. I am a UK based vet. I am sorry to hear you are having problems with your geckos.
Also, please note that we experts are not employees of Just Answer, but independent here. As such, we are not aware of when you posted your question and I apologize if there has been a delay. I will get back to you as soon as I can, there can be a delay (especially with time difference) however I will respond to you. Can you tell me a little more about what is going on?
Adult geckos should not be kept together. Often people do keep them together but in my experience they do not do well. They often fight once they reach adult age and start becoming territorial.
If he is struggling to eat, it is possible he may have mouth rot but you would need to have a vet examine him to check the mouth. Mouth rot is usually gradual in onset. I would advise getting him booked in with a reptile vet.
I would recommend syringe feeding her with lafeber emeraid solution or vetark critical care, to make sure she stays hydrated and get some nutrition into her.
Please let me know if you have any other questions.