Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
For a 72 gallon bowfront I would use the Estimative Index, and get dry fertilizers.
You could start with a bottled product line, but that is a big tank. Much more economical to buy the active ingredient and simply add your own water.
On a tank that large it is OK to dry dose, too. Just add the right amount of each dry product right into the water flow from the filter.
Nice set up!