I give up

I give up trying to feed the cats two different cat foods.  I can't believe how hard it's been and how often I've just thrown in the towel and put their bowls away until the next meal.  Pour one and they both come running.  Try to pick up Zelda and she runs under the couch. Pour her bowl and Cosmo looks up - more food?  Put hers up high on the cat tree and she runs up there (sometimes). He immediately leaves his bowl to come and eat what she's got.  I chase him off.  She eats a little and then jumps down.  Two minutes later I see her eating from his bowl and try to pick her up and she runs off again.

Damn it.  I'm just mixing the two foods together and damn her upset stomach.  Going to have to go with Science Diet Sensitive Stomach.  I hate that food, it's just corn based crap.  I really wanted to keep feeding the Blue Buffalo.  The first ingredient is deboned turkey, not corn gluten meal.