If the female overfills with eggs, she can become eggbound, and will be unable to drop the eggs. White clouds like cooler water, and aren't really tropical. A big water change with cooler water of around 60 to 65 F might induce the spawn, but your tetras probably won't like it. Having a floating plant such as hornwort might help by providing a spot to spawn. With other fish in the tank, it is unlikely that you will get any babies, or if you do, that they will survive. Whiteclouds have been known to spawn and have babies survive in species tanks, but in this csae, the tetras would likely take care of any eggs or babies,probably before you saw them.
Join a fish club. Don't have one in your area? Start one.