Nyagua is a little piece of software that may help you to manage your home aquarium.
It runs on every O.S. that can run Java applications but some features may be used only on GNU/Linux O.S.

Interface is translated in English and Italian but it is not complete for dates and numbers formats...

You can manage more than one aquarium data
It's possible to store test kits measures and to get medium values, or to plot them, in graphs, for analisis.
It's possible to store informations about maintenance activity.
You can store expenses data and to get the relative report.
It's possible to store devices informations and to get a statistic on power consume.
You can store fishes common data near Your fishes data and compare them in a compatibility report.
You can store plants common data near Your plants data and compare them in a compatibility report.
Pictures of fishes or plants can be uploaded and stored in db.

More help at home page.