cat allergies

OK so not to dwell on this cat thing but did you know cats have allergies to none other than CAT FOOD!!! ok so here's the scoop. I had a bunch of dry cat food that the cat was eating just fine and seemed to be healthy on. BUT I was told... you should get a more nutrient cat food and so I went to petco and picked up some iams and some natural type food that was high nutrient. well now I had all this food that I was determined to have the cats eat... so I mixed them up and had a MONDO bag that was difficult to pick up and pour into the auto feeder I have, sooooo..... off to target I went to find a fancy pour thing that is airtight. Basically kitty tupperware. WELL I saw a great deal... the best one I saw was actually free with a large bag of Friskies cat food... and it was only $8 when the less airtight one without a handle was $6 without the food so what would you do..... right! exactly what I did... bought the friskies. So I get this bag home and decide... well I'll mix it all together so that I get a mix of nutrient dense with some that apparently isn't so nutrient dense although still nutrient enough for cat food. NOW I have a larger than BJs supply of this food. GREAT! the cats love it and are eating it up as if it were candy to a 3 year old. well Koneko... apparently a little stressed to begin with because Maggie was now taking over his kitty bed (I've since bought another so now I have 2 at the head of my bed) ... started shedding. I thought it was just the spring shed... it was getting warmer after all and a medium hair cat can be a little hot with all that thick fur. So after some brushing I was convinced I had gotten it all with only some compaints from koneko. well later that day I watched him cleaning himself and he was licking tufts of hair off his tail or so I thought till I noticed he was actually PULLING IT OUT! BITING HIS HAIR OUT!!! and itching. I called a friend of mine as it was late and he suggested it might be the food as RED dye can be allergenic to cats. Well what color was the friskies you might ask??? RED!!!! so now I have this VAT of cat food that makes my cat's skin itchy and fur fall out not to mention that I thought the cat needed some kitty prozac for pulling his hair out of his tail... that fluffy tail :( oh how it looks now. sad. He's not totally bald because as soon as I noticed I went out and bought kitty hydrocortisone spray and skin sensitive cat food and have been feeding them since. Maggie was fine with the other food. no problems at all and in fact she doesn't even really like the new food so I continue to give her that in a dish but both cats only have access to the science diet sensitive skin formula. Koneko has stopped pulling and itching adn seems to be much happier now. purring and kneading as he had been. he's learning to play with cat toys from Maggie as he hadn't been playing prior to her arrival. He seems all around happier with his friend and now with his $15 for a small bag of food science diet sensitive skin. I felt so horrible but who woulda thunk it? my other cat loved friskies as does maggie. so Maggie better like it for years to come cause it's gonna take her that long to eat it all! well off to bed... to share my bed with the 2 cats in their cat beds. one on each side of my head. LOL