I grew all my genlisea side by side in the same media and water tray as my utrics. Media was sand and peat. I would water them to within a 1-2 cm of the surface then water again when the tray was dry. This method worked for the common species, such as violacea and hispidula, as well as aurea, filliformis, pygmaea and others. All grew well and flowered often.
I would, however, not recommend suddenly changing the conditions.