SHinyfish, I am doing exactly what you are doing. I have 1 shoplight fixture mounted on my 55g which gives me 80 watts. I'm trying to do some lowlight plants.
I just pulled my anacharis. Everyone is right, it doesn't like to be planted in a substrate (I use use a mixture of play sand and general purpose sand). I ordered some hornwort from mgamer to replace it as a background plant.
I just planted some dwarf hairgrass, so we'll see how that fills in. I've also got java moss and s. subulata as well as what I think is a sword of some sort. I should get some pics to track the tank progress.
Regarding ferts...I was planning on using the Seachem plan, for the first 6 months to see how everything goes. Once I figure it out, then maybe I'll switch to dry ferts and mixing my own. I've got root tabs in the substrate now, and dose with 5ml of Excel a day, as well as 5 ml of Fluorish 2x per week. The rest of the Seachem ferts (POtassium, Iron, Trace) are on the way. I was kinda hoping fish waste/water changes would take care of the phosphates and that nitrates would be handled by the tank cycle.