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There arent really all in one ferts. If you are running a low light/non CO2 tank, you can get by with the fish and dosing FLourish or perhaps Tropica Mastergrow.

Most people here either use the Flourish line, or mix their own with supplies at places such as www.gregwatson.com

As for WPG, it is an approximation that is outdated. With the various efficiencies of lighting as well as the nice reflector options...and the non linearity of the WPG scale with large and small tanks, it is hard to say the minimum. In general however, most people like to say that 1.5wpg is a minimum, although there are some cases where you can drop to 1 or perhaps less.
I also should note that people tend not to use CO2 till they hit the 2wpg area.
 
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