Nice looking fish and tank. The spawning is natural behavior if they are healthy and happy If you don't want to breed and raise fry (it's a whole other ballgame) you can just let them keep doing their thing and the eggs will disappear. If you want to breed, give them time to pair up and see what happens. The prevailing opinion is that it takes the males longer to mature and figure out what to do. Eventually you'd want a separate tank to breed in.
You mentioned one in jail for bad behavior. With only 4 currently, you're probably seeing a lot of pecking order behavior. When you get your others and put more together in a larger group after QT, hopefully that will settle down.