Join Date: Nov 2007
Location: NYC & Long Island, NY
Are you planning on going with pressurized CO2 or not? The color temperature of your lights sounds alright as long as the T8 bulb does not have a kelvin rating about 10,000 or so. It really depends on what you find pleasing to the eye. I think having 6500 k color rating is too warm, and my lights are a mix of 6500 k and 10,000 k , which I like a lot.
If you fertilize the water column, you should be okay with most plants. Stem plants in particularly are often heavy water-column feeders, whereas something like a sword plant with a rosette would be a substrate feeder (in general). So if you plant any swordplants or cryptocornes, you might consider putting a root tab below them or near them. As long as you fertilize the water column with N,P,K, and micros, you should be fine.
Seachem makes good root tabs. For macro nutrients (NPK) I would recommend dry ferts, as I find them cheap and very easy to work with. For micros, I use Seachem Flourish, which is a liquid.