In the ocean most pelagic fish have huge amounts of eggs and only a few survive. Most become an important part of the food web supplying important parts of the diet to many other animals and organisms.
Yes, clowns can be kept by themselves, however clowns are wired to be social (although sometimes overly aggressive as they establish a hierarchy).
Im planning to add other fish so if I kept one will that clown be social with other fish or just other clowns?