I have an 8 yr old neutered male as well as an 11 yr old spayed female. Because of aggression problems between 11 yr old and new kitten (stray, now fixed, female), I have my 11 yr old upstairs with run of the house. The male and the new stray kitten as well as another new stray that showed up that I took in, spayed female, had run of the downstairs and basement. My 8 yr old male has started spraying about a week ago, off and on, right in front of me!! I've had all the cats together for about two months now. So, I've been letting him go upstairs while I am at work with the 11 yr old and the other two strays stay downstairs. I have the Feliway diffuser, Bach Flower Essence and other essences to try to help. I know he is stressed but what do I do? Let him have run of the downstairs and keep the strays in the basement and then let them out together at night? I've tried feeding them together (goes ok) and slow introductions but still the male is spraying. HELP!!!!!!!