What about frostbite clownsMightyNanoTank said:For a tank that size, you will want to stick with either Ocellaris or Percula clowns. It's really hard to tell them apart nowadays, especially with all the hybrids and designer breeds. They pretty much have the same behavior as well.
Designer breeds have names like Da VincI Clowns, MiamI Whites, Snow Onyx, Snowflakes, the list goes on... do a quick google and you will see for yourself.
If you decide to buy 2 clowns. Try to buy a bonded pair. Usually designer clowns come bonded and only sell in 2's. If you get the regular clowns like me, they usually come in a big batch, I just have my LFS choose the smallest ones. All clowns are born male and as they grow up they will show whose the more dominant one, which will be the female, the bigger one.
Sometimes you might deal with over aggression with two clowns. Just simply separate the aggressive one in a in-tank breeder box for a few days and re-introduce them again until they bond together.
Here are my clowns that I bought separately. They've been inseparable since.