I feed them weruva for breakfast (mixed w/honest kitchen) not as a topper for kibble, only bc mine will scarf the kibble down w/out chewing. They get CC kibble for dinner, they eat it fine w/out any toppers. I guess it will come down to how your's do on the food.
I just wanted to get more moisture in their diet bc 2 of mine have struvite crystals...so moisture is key to getting rid of them.