The live rock will help with filtration ... which is going to be key in a predator tank. You need really good filtration since predator tanks tend to get fed a lot more/heavier than reef tanks. The live rock will also provide a more "secure" feel to fish in the tank, as lion fish like to hide to stalk there prey sometimes, plus eels like caves.
Speaking of eels, you will need to make sure you have a good fitting lid. They are notorious escape artists. They don't quite understand they won't live outside of water. Many years ago I had a snowflake eel that I raised from 7 inches long to almost 1.5 feet. Over the course of the years, he was fine till one day he got it in his head to go exploring the dining room floor. Found him dried up on the floor the next morning.
If you don't plan on keeping corals initially, you won't need an ultra-fancy light.