I just cycled my fish tank and getting ready to add my first ever salt water fish this weekend. I picked up a hydrometer and Phosphate, Calcium, and Alkalinity test kits at the saltwater fish store because that's what they recommended. My specific gravity was 1.021, Phosphate levels were 0, calcium was 500 ppm, and alkalinity was at 10dkh. Are these okay? and any recommendations on first fish and what else to get for my tank?