That's exactly what im planning on, though the ambulia I planted is already growing over an inch each day with only the T8 lights, and that's supposed to be a medium light plant. Also the sand is around 5cm think and the tanks not quite full so the light really only needs to penetrate to 50cm at them moment.
Don't worry, I will.
I really want alot more narrow leaf and windelov java fern to attach to the wood and abit more anubias.