Last Post: 9:50:07pm, 12/02/2018
Keep his claws trimmed so that he can't do damage with them. You can probably either ask your vet to do it or get a pair of claw trimmers and ask them to show you how. That will at least prevent a lot of injuries.
Also get a squirt bottle, fill it with water, and squirt him when he starts harassing the other cat.