Anacharis is one of those plants that doesn't like Excel. It will get used to it, to some extent, if you start with low doses, but it can kill it.
Flow is one of those things you have to mess with, to make it work like you want it. I have a single return in the center of the tank, so the plants can grow tall without being overtaken by the flow.
Standard 10 Gallon (20 x12x12).
Low tech, Sand substrate.
Eheim 2211, and Aqueon Quietflow 10.
Finnex Stingray LED, 20" above substrate
2 Anubias Nana Petite, Christmas moss.
4 Halequin Rasborahs, 5 RCS.