We have two Schwartzis and a panda. Once our tanks stabilize we will definetely get more. I cant be sure that fish feel love, but they certainly appear to have an affinity for each other. I would say they spend 95% of the day within an inch of each other. The panda is the most active of the 3, but she gets the others going and they will swim synchronously with each other. Really fascinating.
If you have a big enough tank, I would definetely say get a couple schools.
If you have a big enough tank, I would definetely say get a couple schools.