The Narcotics Control Bureau (NCB) on Friday arrested two persons for cultivating marijuana using hydroponics inside a two bedroom hall kitchen flat at Palava city, Dombivali. NCB officials seized one kilogram of the marijuana from the flat. They also recovered cultivation setup, pH regulators, plant nutrients, clay pebbles , water pumps, air circulation systems, CO2 gas cylinders, photosynthesis lighting systems, etc. from the flat.