I never use the special diets, focusing only on having them eat well and enjoy their meals. I rely on fluids therapy (150cc every other day in the early stages once stabilized) and then dealing with the later issues, anemia, high phosphorus, stomach ulcers, etc. as they arise, usually years later if the condition is caught early. The vets I've seen, my own and several at the shelter, have been fine with this program, saying there is some doubt special diets are the best way to go.
Instead of giving him Tumil-K, you could put potassium directly into his fluids bag, and add vitamin B12 - that's the mix I get from the shelter clinic and anything that means fewer pills is good for both the cat and you.
Anyway, it's wonderful that Tama has bounced back so very well. When I took Sam to foster she was a few days from being euthanized because she was losing 1/2pound a week and wouldn't eat. With twice daily fluids, a quiet room to herself, and any food she wanted, she bounced back with a vengeance much to everyone's surprise. It's been nearly two years now, she's on Epogen injections after a blood transfusion and her levels are starting to rise, but she's still really enjoying her life - and that's the bottom line.
Many more years to Tama!
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