Similar, but the lava rock used in aquariums tends to be a bit cleaner and larger chunks than what's marketed for gas grills. Neither are actually lava, but are a by-product of (???--can't recall what it is!) processing.
For lights--with no photosynthetic critters, if the room has lighting, you can run the tank lights just when you are there to observe the fish. A mix of white (so called natural light) and actinic is good--you can experiment and see what you like. If the room is very dark, you'll want to run lighting to simulate daylight for the fish--I would go with 10 hours total, with about 1 hour of dusk/dawn as part of that.
For lights--with no photosynthetic critters, if the room has lighting, you can run the tank lights just when you are there to observe the fish. A mix of white (so called natural light) and actinic is good--you can experiment and see what you like. If the room is very dark, you'll want to run lighting to simulate daylight for the fish--I would go with 10 hours total, with about 1 hour of dusk/dawn as part of that.