Hi, I am thinking of adding a third T8 to my tank to increase the wattage. However I don't have room in my hood for a T8 that matches the length of the tank. My tank is slightly over 3 foot, and currently I have two T8 36" bulbs in the tank. There is some room in the front of the hood where I could add either a 24" or a 30" T8. Would I get many problems if this additional T8 doesn't reach end to end of the tank?