+1
On my old 55g I Just crammed in some egg crate 3" in front of the back glass. and added 2 4' two tube 6500k shop lights 4" behind the tank pointing forward. Costs with tubes $25-30 or so. (+$10 for the egg crate) and put chaeto and caulerpa between the back glass and egg crate.
nitrates dropped to 0 in 3 weeks and phosphates a few months later. Meanwhile my two tangs were constantly grazing on the macros that poked through, pods thrived, and smally fish would go through the egg crate for pods and stuff.
my .02