The tank is not heavy planted only half of it is planted. About the light,
it is a big difference about 2.2wpg on 29G and 65G. When you get 2.2wpg on
65G is the same as 3.2 on 29G.
If that's true, then you have to increase your CO2. Get compressed CO2, use
larger batches, or reduce the turbulence in your tank.
But I'm not so sure that it's true. While the watts per gallon relationship
does break down with very large tanks, I wouldn't call a 65 gallon all that
large. Moreover, it's a very deep tank -- deeper than a 29 gallon, even deeper
than a 75 gallon. The deeper the tank, the more light you need. Your tank is
25 inches deep. It's awfully hard to light a tank that deep.
it all depends on bulbs. For example my 2 40W Plant gro bulbs (red) = 1 32W
white bulb. I can definitely say that 1 32W bulb is way brighter than 2
Plant Gro 80W (red) bulbs.
It looks brighter to human eyes, but not necessarily to plants. It's the
wattage that matters, not the color. If you don't have enough light over your
tank, using different color bulbs isn't going to fix the problem.