Hi John
Thank you.
With regards your set-up you can quite easily have a high impact aquascape but remain low maintenance. The key is using just enough light to support plant growth. You can still grow nice plants, especially if you use decent substrate, ferts, CO2 and circulation. Get these factors right and light is almost secondary. Too many folk focus on the light first, then skimp on the rest, and wonder why they may get algae.
So in your case 2 x 24w T5 may be ample.
I say give it a go. If you find it's too much trouble then at least you've tried.
Cheers,
George