please help

I have a new hobby - a saltwater fish 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). whether it is their first tank ('Yes or No), and how long (in years) they have been in the hobby. It was desired to determine if the average tank size of all Central Florida reefers is less than 90 gallons. Mistakenly, I created the Statistix printout shown here: One-Sample T Test Null Hypothesis: H = 90 Alternative Hyp: 1 # 90 Variable Mean SE DE 71. 260 5.8626 -3.20 49 0.0024 Cages Included 50 Missing Cases 0 What alternative hypothesis should I test to learn the desired information? O'Haig >>90 O Haim = 10