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We tried feliway, too hard to know how much difference it made. But worth giving it a go.
We got Nico (tabby) when Fred (now departed) was quite old. Fred attacked Nico at first. These two never really became friends but Fred did learn to tolerate Nico.
Then Fred died and we got Stevie (black and white muppet featured above). We assumed Nico would be fine with Stevie as Nico had never been an "only cat" like Fred had been. Turned out not to be the case. Nico bullied Stevie and we had to separate them at first. Within a month most of the violence stopped though.
Now they get on well with the occasional play fight.
That's good to know, cheers! By "weren't best friends" do you mean like fully acting like they want to rip eachother's throat out or more like non-contact hissing and yowling?
Ordered a feliway diffuser which comes highly recommended so hopefully that will help them become friends again!