Bleached too be sure, 2x96 is not enough light on a 90 gallon tank. I have a 90 gallon tank and have 940 watts of lights VHO/MH combo, worked very well for me. you will need at least a 440 VHO or equivalent PC lighting over that 90 gallon. As the 90 is 2 foot deep I would suggest you look for a MH type lighting or a VHO/MH combo or PC/MH combo.
In the mean time try feeding it meaty foods like mysis shrimp 3 times per week.
There are many reasons it could be bleached, however I suspect lighting right off the bat. You may also want to check water paramiters to be safe, include calcium and alkalinity. Double check the small things like temp, stray voltage, preditors..etc..
Thomas