We dose 30ml of Flourish after the weekly 75% water change and 45 ml of Excel daily (or every other day depending on if we forgot, lol). Our substrate is entirely Pool Filter Sand, so no nutrients there. The Fahaka dives into it constantly, thus the reason for not capping it or going with anything nicer. If you can get ahold of Metricide 14 it is basically the same thing as Excel, but twice as strong and far cheaper.
"In the land of the blind, the one-eyed man is king" Desiderius Erasmus