All depends, you want 125w, that is about 42 LED's.
Are we talking about the frag tank where you had that T5 light over?
I am not sure those 2 drivers would put enough. Maybe with the 3. You could do 1 driver with 12 blue. 1 with 12 white and the 3rd driver with 7blues. That way you could adjust them to get the Kelvin rating you want. That would give you 31 leds. Which I think would be enough for that frag tank.
Shoot me a PM, we can talk more.