When you start getting into higher watts per gallon the light is no longer the limiting factor so to have high light by no extra CO2 will just produce algae. 7 watts would be good for a low light tank with no extra CO2. I've never used LED, but I know people around here have.
And even though you've ordered the hairgrass...I might just not bother with it, it makes a horriable mess when it dies.
Good luck!
Glad you like the art!
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