My cat has ckd and now ibd or small cell lymphoma. I'm trying to find a food suitable for all his issues and wondering what level phosphorous I need to look for. My vet mentioned his kidney levels aren't that bad yet and I can feed regular, non prescription food. I know the prescription diets have a phos level of .5 on a dry matter analysis but that's fairly unrealistic to find in regular cat food, most have anywhere from .7-2.0