Hmmmm,

Evil Black cat syndrome.... Lol I think I have your Monty's twin, my Buddy is a terror with the girls and a couple of the boys.

If I were you I would get my hands on the largest enclosed dog crate you can find... put a bed, a litter box food and water in there and place it right next to the feliway outlet, when he starts playing up put him in time out for an hour or so.

Also a spray bottle is very useful or a can of pennys, when he start stalking spray him with water or shake the can and tell him no..... try to distract him with a toy, I have found da bird is wonderful for that, at night I would also try him in the crate, although I will guess he will howl the place down... buddy did.

We have reach a point now where the fights are at least few and far between although we have odd days were I could happily rehome them all.

All 20 of the cats seem to co-habit fairly well these days and for a cat, at 2+ Monty is at that terrible teen stage.

It make take a while but eventually he will put 2 and 2 together and calm down.