Maintainance app, or pen and paper?

[BuschWacker]

I use an app called 'aquaplanner pro'. Has alerts, reminders, graphs all your data. I like it. It does everything I need it to. And it saves to the cloud, so I can use it across multiple devices.

[matt_C]

i use a calender that i have behind each one of my tanks.
i write down when fish are added, corals, are added, water changes, tests, etc....