I find it sad that people do not want to pay for medical treatment for their pets. Whether it's a $2 newt or a $20000 thoroughbred horse, it still deserves vet care if needed.
If you can't afford vet care, I understand, times are tough. If the animal is just wasting away, and vet care is impossible (due to location, finances,or whatever) euthanization would be the most appropriate thing. Short term, I would get it into the Correct-PH'ed water and maybe go look at others frrom the pet store where it was purchased; if they're sickly too, it is not your fault. Too bad that animals are available to people who are unwilling to take the proper care of them! I lament!
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*~Ginevive~*