AquaLog 3.0 is a program designed by ArcTan Technologies to record and keep track of all records associated with maintaining an aquarium. It includes sections to track water chemistry, fish records, expenses, tank maintenance, and more. AquaLog also includes a journal, calendar, and photo gallery so that you can stay on top of everything that pertains to your fish. Everyone from beginner to expert can use this program, whether you're keeping a freshwater or saltwater tank. It is completely free; ArcTan only asks that you fill out a user survey online.