Now I'm a pro and don't need an app and graphs of my params to see things are going well. This is a gadjet.
Juste remember thoses optimal things:
: The less possible
: Depends of fishs, 8-10dKH° for reef
: depends of fishs
PH: Depends of fishs, 8-8.4 for reefs.
Temp: Depends of fishs, 25-27.5 C° for reefs
: 400ppm for reef
: 1400ppm for reef
Just by knowing this and about the nitrogen cycle, you don't need this app. But if you wants graphs of the params and give name to your fishs, this may be cool