Ahhhh, cichlids!
With these fish this type of behavior is expected after new introductions - nipped fins and cichlids often go hand-in-hand. In my experience with Bolivian Rams, the damage is slight and once dominance established they typically are very peaceful toward one-another.
Be sure to keep their water very clean water so that those fins heal quickly, and keep a close eye on things as they settle in. Lucky for you, this is a fun time to watch them! ^__^ You can expect to see a lot of displaying, often rapid changes in coloration as they show off for one another or pale out in submission, chasing, and lip-locking. . . particularly during mealtimes. Whichever turns out to be the dominant of the two will typically show brighter coloration, though they will challenge one another from time to time, just to make sure
Darkening and paling of the vertical stripes and the spot(s) is very normal, but watch out for 'stress stripes' which on these fish run horizontally from head to tail, and are made up of many small black spots. These may come and go, but if one is showing them constantly, especially when combined with pale coloration, you may have a problem.
Do pay VERY close attention to the female. . . I should have suggested that you wait to bring the male home until she had returned to her normal behavior - I'm still a bit worried about that one. :/ She won't be having a very happy week, on top of a rough patch just before! I've found that it often helps to do a rescape of the tank when adding a new ram - this will remove her existing territory, and put them both on equal footing as far as finding a new favourite spot in the tank. I would also encourage you to add more rocks/driftwood/plants if at all possible. This will create new territories, and break up their lines of sight (so they can't always see one another!) - it will certainly help them to both settle in more quickly, and hopefully - happily!
A last note of caution - you will want to keep an extra close watch on this pair (yes, repeating myself, lol all eyes to that tank!) as they are a single male and female. Rams can be very fussy, and prefer to choose their own mate, rather than having one chosen for them. If one gets sweet on the other, but the sentiment not returned, you may run into trouble and have to separate the two (this may be what happened the first time around). They can and will fight each-other to the death if they are unable to escape one another when/if desired. In a tank like yours, I think it should be okay, but pay close attention until you know for sure. If they do have trouble, you should consider in advance what you wish to do. I know you can return the male to your father's tank, you could also bring in a few more females if stocking allows for it. Hopefully, you won't have any issues - just wanted to mention to keep an eye out for them. Livvies can be fussy little critters sometimes - all cichlids can.
Fingers crossed that they settle down perfectly for you, and live long and happy lives in that pretty tank of yours! Please keep me posted on how things are going!