Most of the equipment that came with your tank is best used for freshwater tanks. If you want a saltwater tank you'll want to take out all of the freshwater gravel, rocks and decorations. I wouldn't use the HOB
filter either. You can use the canister filter for chemical media like carbon, GFO
, and or Purigen. The lights may just need new lamps but that depends on what kind of light fixture it is and what you intend to keep in the tank. If you want corals the lights will need to be very powerful.