I currently run two Vegas on my 40b and am in the process of upgrading to a 90g. The 40 is 36" and the 90 is 48". I have the 6" ext rail kit for the lights now. I know I'll probably need the 12" rail to spread the two lights out further. The new tank is deeper but the lights should still be ok for corals right ? Just have to crank them up more ?