Tank Mate is the perfect app for the aquarium enthusiast. It is designed from the ground up to be an easy to use and intuitive utility that any aquarium keeper can use to make things more manageable. - Add multiple aquariums each with their own: a. Water Test Logs (choose which parameters you want to test and the order to test them) b. Graph for your water tests with custom "Ideal Zones" you can set c. Customized Maintenance Reminders d. General Notes - Salinity calculator that helps you get a perfect salinity in your tank - Salt mix calculator that tells you exactly how much salt to add when mixing up saltwater (this is calculated to your specific salt mix from an easy test) - Volume Calculator: calculates volume, surface area and weight for your display tank, sump and refugium - Sand Bed Calculator - Can enable iCloud to sync your data between all your devices - More features and calculators can be added upon your request Keeping up with all your maintenance can be difficult and time consuming. Tank Mate is designed to carry some of the burden for you by reminding you when things need to be done, keeping a log of all of your tank's parameters, performing tedious calculations/trial and error that comes up when getting your salinity perfect during water changes, performing calculations to help you get your salt mix right the first time, and more.