My friend was talking about setting up a 5 gallon tank as a nano tank (i believe they are called) and I want to help him get started for his birthday by buying some things he might need.. what is a good recommended Lighting and filter for a tank this small? i know he said something about soft corals to put in it.. I dont know a lot about these types of tanks but he currently has a 75 gallon salt water tank.. Any recommendations of things I might be able to buy to get him started?