A lot of "bulbs" are seasonal plants in nature. They start growing when the rains come, develop leaves and flowers, then use what is left of the season to store "food" in the bulb, and at the end of the season - die down and lay dormant.
Many bulbs sold are dormant, and when planted, rapidly develop leaves and flowers, then big leaves for a while and die down. Most people throw them away then. Mistake.
Some will start to grow again without any action, indeed, there are some cultivars that no longer need a dormant period, they produce leaves continually - they tend to be more expensive.
Most NEED a dormant period. Some will lie dormant in the tank, but most require the bulb lifting, and storing at a lower temperature for 8-10 weeks before replanting.
Some require really cold conditions, like storing the bulb in a refrigerator for 3-4 months, before replanting.
The majority of "bulb" plants grow quite large, and throw a lot of leaves quickly. They are not, thus, suitable for really small tanks. That said, they are VERY attractive, and many people love them.