The tank is a 120 (tall) 60x18x26 LxDxT. Unfortunately it has a blacked out center brace which complicates things. My current setup (at least in terms of lighting) is 4 black box lights and 2 ATI Blue Plus bulbs. My existing setup already grows Acropora, Miliporas, LPS, pretty much anything but I want better color and shimmer which is something the black boxes cannot do. I already have 3x Kessil A360WE Tuna Blue's in my possession. My question is do I really need a fourth light or can I get away with 2 or 3? If 3 then how do I orient the third lamp? Thanks everyone! TLDR Version: big tank with a center brace, 2 or 3 Kessils? Or do I absolutely need to purchase a fourth light.