New cats aggression toward other cats

kittiekate89

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I posted here before about the stray we took in about 2 weeks ago. Thankfully his yowling and wondering has stopped, but now it his aggression towards my other 5 cats (3 boys,2 girls). He mainly hisses at them when they walk too close to him but lately things have gotten worse. The other day my female black cat was in the window with him and guess she got too close and he hissed and swiped at her. Then last night him and my deaf cat got into it BAD. My boyfriend and I went into the basement to find huge piles of vomit, chuncks or cat fur and the stray poking his head out from behind the furnace and my deaf cat standing by the doorway. Checked the stray today and he has some marks on him but my other cat seems to be fine.
Now tonight. My one male cat and the stray went nose to nose sniffing. The stray hissed, so my male cat backed off and walked away. Then the stray hunched down, wiggles his butt and pounced on him! One or both of them were howling then in yelled and they both took off and his under the bed. We got my male out and locked the stray in the bedroom and my poor guy was shaking!!
Not sure what to do about this. I know its soon for everyone to get along, but attacking my other cats is NOT okay. Any suggestions??
 

shadowsrescue

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