I am currently running 2 (4 blub 54w) so total of 8 bulb t-5 setup on my 90g mixed reef tank. I am wondering if i can get away with one of these

http://www.marinedepot.com/Marinelan...FILDFX-vi.html

now i can't beat that price but i just dont see me getting the same about of light output etc. Should i go with 2 of them or will one be fine life stock in tank is

corcea clam, zoes, mushrooms, trumpet coral, finger leather, ricorda, clove poylps, and yellow polyps (freaking weeds) and a mixture of fish. of course my main concern is the lighting for the corals and clam