Raw FRESH chicken is OK as an occassional offering. Keep in mind that chicken, as well as any terrestrial warm-blooded animal, will contain fats that break down slowly in aquaria and can really foul up the systems parameters. A better bet would be to feed the cat cleaned and cut beef heart, chicken hearts, fish fillets, etc. But, as with everything, a proper balance should be sought to ensure your cat gets everything it needs to grow healthy and active.