please help

I have a new hobby - a saltwater sh tank that will contain mostly live corals (called a reef tank). I am currently in the planning stage and am gathering knowledge to give me the best chance of success with my tank. As part of the planning stage, I reached out to 50 experienced Central Florida reefers (people who currently have a reef tank) and asked them to provide the following information: Size of the tank (in gallons), Type of Lighting used (Florescent, LED, Hybrid, or Other), and how long (in years) they have been in the hobby. Identify the following terms as they apply to this story. Experimental Unit [Choose] V Variables Tank size 1 v Population The 50 Ce V