Just a qwik check back. Heres what we do: Actinics (blue) for 1 hour in the morning, 8 hours full lighting (blue and white) and 2 hrs just blue in the evening totaling 11 hrs. Remember, we're running a 55, so I cant be sure exactly what your requirements are. Are you understanding what we're saying about the light times? Not a flame or anything, just want to make sure we're all on the same page.
And, just to be sure I'm understanding you, you still have the LTA with no corals around it, but you do have other corals. Is this correct? If so, what other types of corals do you have?
If you are still in the planning stages of purchasing corals, I would suggest upgrading your lights, if you can. If upgrading is not an option, then start with simpler/low light corals such as mushrooms, GSP, ricordea or zoos. The standard formula for lighting is: total wattage divided by # of gallons. In your case: 4 x 65w =260w 260 divided by 90 = 2.88888. Most corals require 4-5w per gallon. This is not a "law" you need to abide by, but it gives a good starting point.
Hope I can check in while I'm out of town to see how things are going, but if I cant hopefully some others can pick up on the thread and help some more. You may want to start with more info about your tank: water parameters, what type of filtration, how long has it been running, hows the water flow (power heads,etc), maybe a full tank pic to get a better idea of what your set up looks like.
I've got to finish packing and get some sleep. Hope I've been helpful. Later.