The guide and the project record book included in this document are designed for 4-H members who would like to start a salt-water aquarium project. The guide includes the following topics: (1) general requirements for salt-water aquariums; (2) directions for making an aquarium; (3) suggestions for where to locate it; (4) pros and cons of using artificial sea water versus natural sea water; (5) types of material to use in the bottom of the aquarium along with instructions for cleaning it; (6) a discussion of filters, subsand filters, pumps, power filters, decorations, lighting, and heating that could or should be used; (7) recommendations on how to fill the aquarium with water; (8) guidelines for purchasing animals for the aquarium; (9) drawings of seven hardy tropical fish; (10) suggestions for collecting marine animals from natural environments; (11) procedures for introducing newly purchased or collected animals to the aquarium; (12) tips on feeding and water maintenance; (13) solutions for two common problems associated with salt-water aquariums; and (14) a 15-item bibliography of books and pamphlets on maintaining aquariums. The project record book contains a checklist, an activity sheet, charts, and record sheets to be filled out during the project. (JW)