"Hi. Don't mind me.
I'm just enjoying being near you while you do your boring computer stuff."
This brings me to the advice part. See the patches on the outside of Scarlett's right ear? It would seem that Melly is getting more aggressive with Scarlett, sometimes to the point of drawing blood. The cuts aren't bad, but that's beside the point: there shouldn't be any cuts at all.
I've started adding Rescue Remedy to the cats' food and water again, and I ordered a bunch of refills for the Feliway diffuser as well as some Feliway spray. I was thinking about another cat tree to add some more vertical territory to the apartment, but I don't think that's really the issue since the current cat tree doesn't get much use. Keeping the cats separate isn't an option since I live in a one-bedroom apartment where the only interior door that closes is the bathroom.
Does anyone have suggestions for other things I can try?