Forgot to mention... I'm using Innova Evo on my cats. It's not carbohydrate-free, but it has no grains, and it is much lower carb overall than most other stuff out there. And their coat quality has improved. One of my babies is a long-haired red tortoiseshell, and her coat is just awesome in bright sunlight.
I'm starting to make more homemade stuff for my cats (leftover chicken, human-grade on-sale tuna, etc., a few cans of stuff I think is safe for them).
Eventually, I'm probably going to end up biting the bullet, investing in a grinder, and putting them on a raw diet plus Evo.
You can purchased Jack Mackeral..... wash it first, because it’s salty, but the Jack Mackeral is low in mercury.. another thing that is good is sardines... for our dogs and cats a sardine a day is good.