The tank should be kept filled with water at all times. Be careful when you fill the tank not to let water soak the soil. Bromeliads are prone to root rots if the soil is kept wet. Flush the tank periodically by pouring fresh water into it, inverting and filling again. This will prevent stagnation and buildup of mineral salts.
Proper drainage is essential.
The soil mix must be porous enough to allow water to drain off quickly and allow air to reach the roots. It should never be soggy. Bromeliads need humid air to prosper. Most houses are not moist enough and you will need to provide humidity for your plants by misting them frequently. Bromeliads need fertilizer but use it at half strength or less.