You can grow them in a belljar setup as Nick describes or in a glasshouse like a normal potplant once they are converted to fully emersed growth. The conversion is the hardest part. Some plants do best moist and others don't worry. In either case they need to be well watered. In a wet situation the fertilizing is similar to hydroponics and in a drier situation you need to add fertizers as you would for a potplant. Some prefer some sunlight and artificial light, others just sunlight and others do not do well with just artificial light. There is a lot of "try it and see" involved. C. balansae and the ones from Sri Lanka prefer harder water and a bit of calcium.