I think running two 30" bulbs would be more than enough light. I wouldn't even try three or four.
If that's the case, consider a two bulb fixture running only one bulb. Try it for a good while ( aka at least 3-4 months) and see if it works for you. If not you can go to two bulbs. If you don't need the light I generally don't recommend adding it. It just complicates things. You want light to limit your growth, not ferts or co2.i plan on having the hc towards the top of the tank on a piece of driftwood im thinking about getting. dont know if ill put any on the substrate.