I've had a bunch of requests for a downloadable version of
my website calculators.

I've just finished a Windows application that includes the
Nutrient Dosage Calculator, the CO2 Calculator, and the
CO2 chart.

The CO2 Chart is dynamically created, allowing the user to
change the low and high pH and KH values, the step sizes, and
the color coding.

The CO2 calculator allows you to enter a measured pH and KH (KH
in degrees or PPM) and will give you the calculated CO2 level.
It also allows you to enter your measured KH, your desired CO2
level, and will give you the target pH.

The Nutrient calculator lets calculate how many PPM of a nutrient
you will add to your tank. It allows for mixing a solution, or
directly dosing the dry ingredients to your tank. Tank size can
be entered in either gallons or liters. The calculator will also
warn you if you are adding more nutrient than would dissolve in
your solution.

There is no interface for adding new nutrients, but the nutrient
information is stored in a standard windows "INI" file, and can
be edited using any editor to add new nutrients. The next version
will have a user-interface section to enter new nutrients.

http://www.csd.net/~cgadd/aqua/art_plant_aquacalc.htm

Chuck Gadd
http://www.csd.net/~cgadd/aqua