Help! Do I have too little or too much light?

I have a 77 gallon tank with fishk, inverts an corals. The tank came wit T8's so I have one daylight T8 and one blue T8 both are 39W, i then bought a ballast and installed two T5's, again one daylight and one blue, so am running 4 in all, is it enough? Too much?? and how long should I have them on? I also don't know how old the T8's were when I got the tank, how often should I change the bulbs? This is a deep tank by the way, 47 inches long X 24 inches deep.
Thanks for your help!

 

The bulbs should be replaced about every 9 months, give or take.
A normal lighting schedule is around 10 to 14 hours a day. Some people like to stagger them, the get a sunrise/set effect.

Do you have good reflectors above all 4 lights?

With 4 bulbs you should be able to get all softies, leathers and some LPS to grow in your tank.

 

I would replace the T8 with T5s. T5s last 12-18 mos. T8 I believe only 6-8 mos. The T5 should be HO or VHO depending on what the ballasts are rated for. A total of 10-12 hours is more congruous with nature. Some will have their "blues" (actinic) start out their light cycle for 1-2 hours and then the "daylights" come on (actinic stay on) for 8-10 hours and when the "daylights" go off the actinic stay on for another 1-2 hours.
Also it seems to me you would want 54 watt but I am not that expert to tell you that you need to have 54 watt.

 

What are the dementions of your tank, specifically how tall is it?

 

What are you thinking about keeping in the Tank? More that softies (mushroons, toadstools, some zoa) I'm afraid you are under lighting by quite a bit