Before you take a step back, try the Comfort Zone plug-ins. I've heard good things about them. I have used one when we brought a dog into the house, but my cat is so mellow that I couldn't see if it worked or not.

The cats may never "warm up" to each other per se. Even if they do, this takes time. Right now they are establishing a hierarchy with the growling and the hissing. Unless they actually start to physically fight, you should probably let them see if they can work it out.

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Smile, it will make them wonder what you are up to!

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