The lighting

The best option is to buy an electric light, of course isolated from the tank, so the salt will not damage the metal parts. It is the same story with the light as with the water conditions. If you want to have a natural looking aquarium you have to provide a lot of bright light, just like it is on the coral reefs. But such aquarium is full of algae so the water is not crystal clean. Generally, if you want to have a clean water in the tank then you need less light. On the other hand, less light means less algae which is a natural fish' food. The light should be in the form of long fluorescent tube. If you use normal wolfram bulbs, the water could overheat.