If you are interested in a reef, eventually, this is how I would proceed...30gal tank, 60lbs of LR, 3in LS bed, good skimmer for starters. YOu can research lighting down the road. Some nice fish choices would be percula clowns, royal gramma, purple firefish, clown gobies, shrimp gobies, sixline wrasse or a couple reef chromis. You will be limited in the number of fish you can put in a 30gal SW tank. 3-4 small fish max I would say.